Roto Grip

Roto Grip Magic Gem Bowling Ball

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  • Roto Grip Magic Gem Bowling Ball
  • Roto Grip Magic Gem Bowling Ball
  • Roto Grip Magic Gem Bowling Ball - Defiant Core
MSRP: $242.95
— You save $43.00


Roto Grip Magic Gem Bowling Ball

  • Color: Citrine/Rhodonite/Jet
  • Coverstock: MicroTrax Hybrid Reactive
  • Weight Block: Defiant LRG Core
  • Factory Finish: 2000-grit Abralon
  • Flare Potential: High
  • Radius of Gyration (RG): 16lbs - 2.47; 15lbs - 2.47; 14lbs - 2.50
  • Differential (Diff): 16lbs - 0.051; 15lbs - 0.053; 14lbs - 0.052
  • Intermediate Differential (Diff): 16lbs - 0.016; 15lbs - 0.016; 14lbs - 0.015
  • Fragrance: N/A

Additional product information:


Given the overwhelming success of the GEM and Exotic GEM around the globe, we felt it was important to add another viable reaction to this series of balls. So with that direction in mind, we went to work testing various coverstock materials and ultimately circled back to the often imitated, never duplicated MicroTrax material which features nanoparticles mixed evenly throughout the entire ball just like the solid and the pearl before it.

However, this go round we opted to go down the avenue of hybrid in order to compliment both the solid and the pearl. So with that, we tested all the various combinations of hybrid, and in the end, the 2pt pearl / 1pt solid presented the most performance while complimenting both the GEM and Exotic GEM without overlapping either of them.

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Additional Information

Lane Condition:
Factory Finish:
Reacta Gloss
Core Type:
Hybrid Reactive
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22 Reviews

  • 5
    Roto Grip Magic Gem

    Posted by Kevin Duncan on Nov 26th 2023

    Roto Grip Magic Gem Layout: 4.5 x 5 x 2 Storm Pin Buffer Layout Rev Rate: 325 rpm, 7 degree of axis tilt, 40 degree of axis rotation Testing information: 41 foot THS (medium to light volume) Bowling Center: Fulton Bowling Center Kegel Machine – Brunswick Anvilane The Roto Grip Magic Gem utilizes the MicroTrax hybrid coverstock and the Defiant LRG weight block. The speed dominant or low rev players are going to love this one. The design of the Magic Gem was to fit between the Gem and Exotic Gem. I think this was accomplished but the Magic Gem is closer to the Gem, which isn’t a bad thing. I will use the Magic Gem on long oil patterns and heavier oil patterns. This ball will fill my No. 1 (first ball) slot in my tournament bag. I don’t have my Gem anymore so the Magic Gem came into my life at the right time. Lol Visit your local Storm VIP Pro Shop! #Stormnation #SquadRG

  • 5
    Roto Grip Magic Gem by Casey Murphy

    Posted by Casey Murphy on Nov 22nd 2023

    Orientation: Right Handed Rev Rate: 400 RPM Speed: 16-17 MPH PAP: 4 ½ over and ½ up Location: Enterprise Park Lanes, Springfield MO Pattern: High Volume THS VLS Layout: Layout 1: 5 x 4 x 2 ½ (pin above bridge) Layout 2: 4 ½ x 4 x 4 1/8 (pin below bridge) The Magic Gem is the strongest Gem in the back part of the lane ever! Think early jerk. The Gem is early and slow. The Exotic is cleaner and snappy. The Magic Gem hybrid version is earlier than the Exotic by a good deal and WAY more on the backend than the OG Gem. Honestly it was hard for me to keep it online unless I threw the ball pretty hard. If you want to HOOK the ball I honestly can’t think of a ball that hooks more overall for me. If you don’t have oil or ball speed, BEWARE! This is a ton of HOOOOOK.

  • 5
    Magic Gem

    Posted by Todd Benner on Nov 17th 2023

    The third release in the Gem line combines the best of the two previous releases. The Magic Gem has the same Defiant Asymmetric cover as the others, but the Magic is wrapped in MicroTrax Hybrid Reactive coverstock finished at 2000 grit abralon. The 15-pound version has a RG of 2.47, a differential of .053, and an intermediate diff of .016. Drilled at 5x4x2 (pin above bridge for me), this ball is a monster. It has almost as much total hook as the original Gem, but the motion is very different. The Magic Gem’s reaction is more delayed than the original. It pushes a good 3-4 feet further down the lane before it starts to read the lane. The backend motion is much stronger than the original Gem. This ball is the perfect complement to the original Gem. Once the original is starting to burn up a little too soon, that is the time to go to the Magic Gem. The Magic needs a good amount of oil to be effective, but there is very little quit on the backend even when your angles are pretty open. In my opinion, the Magic is the most versatile of the three Gems.

  • 5
    The Magic Gem

    Posted by Rick Klimowicz on Nov 15th 2023

    Magic Gem • Roto Grip • HP4 Series Core • Defiant LRG Core (Asymmetric) Weight • 15 lbs. RG • 2.47 Differential • .053 Intermediate Diff•.016 Coverstock • MicroTrax Hybrid Reactive Finish •2000-grit Abralon Layout • 4 ¼ x 4 ¼ x 2 ¼ Tester PAP • 5” R, 5/8” D Tester Axis Tilt • 9° Tester Rev Rate • 250 Test Pattern • 42’ THS (Typical House Shot) • Modified, Kegel Stone Street Roto Grip continues its successful Gem line with the release of the Magic Gem. And what makes the Magic Gem so magical? Roto Grip has wrapped the MicroTrax Hybrid Reactive coverstock around the proven Defiant LRG Core, making the Magic Gem a predictable pin-crushing rolling machine. So, let’s take a closer look at what makes the Magic Gem an excellent choice for your arsenal. The LRG Core has been the heartbeat of Roto Grip’s Gem line and continues its pumping success inside the Magic Gem. Being a straighter low-rev player, I liked how the Defiant LRG had a smooth and continuous roll in the mid-lane yet stood up with authority when it turned off the pattern. And rather than being lazy and slow to make its decision like large asymmetrical cores tend to do, the Defiant LRG Core makes a decisive and predictable motion to the pocket and still retains a powerful punch through the pins. And being a large asymmetrical core, I could count on the Defiant LRG Core to have a strong and continuous roll through the pins without the deflection I tend to see because of my slower rev rate. So, if you are a down-and-in player like me, you can count on the Defiant LRG to kick out those troubled corner pins we tend to see and keep your game in play when you need it most. The Hybrid MicroTrax Coverstock is an excellent choice for straighter, low-rev players like me. The two-part Pearl and one-part solid Hybrid mixture brings a combination of traction and smoothness that is ideal for players like me. Unlike some solid coverstocks that tend to roll out and lose energy through the pocket, the MicroTrax Hybrid has the right amount of solid to get you through the heads without being overly aggressive, which causes the ball to burn up energy. And unlike pearl coverstocks that go far too long before they make their turn, causing you to 2-8-10, the two-part Pearl in the MicroTrax Hybrid coverstock has smooth traction when it finds friction and blends the transition of wet/dry without being jumpy or erratic off the pattern. So, if you are a straighter, down–and–in bowler like me, you can count on the MicroTrax Hybrid Cover to deliver a predictable and stable motion all night. In closing, the Magic Gem is an excellent new release by Roto Grip! And with the Defiant LRG Core and the MicroTrax Hybrid Coverstock combination, the Magic Gem is perfect for any down-and-in low-rev player like me. So, stop into your local Storm VIP Pro Shop and have the Roto Grip Magic Gem ready to roll for tonight’s league. Your game, scores, and team will be glad you did! Rick Klimowicz Storm Products Pro Shop Staff Roll the Ball Pro Shop Penndel, PA

  • 5
    New Benchmark Ball

    Posted by Steven Collins on Nov 14th 2023

    Dual Angle Layout: 55 x 4 1/2 x 35 Storm Vector Layout: 4 ½ x 4 ½ x 2 ¼ This ball is STRONG!!! When there is a heavy volume of oil this is the ball for you. This ball has been the perfect fit between the original Gem and the Exotic Gem. This ball gives me good length, a strong midlane reaction, and plenty of pop to kick out the corner pins. The Magic Gem is super versatile, I’ve used the ball with surface and with polish and either way the ball continues to perform.

  • 5
    Magic Gem Review by Kyle, Joel, & Dean Johnson

    Posted by Kyle, Joel, & Dean Johnson on Nov 10th 2023

    Roto Grip Magic Gem Coverstock: 2000 Grit MicroTrax™ Hybrid Reactive Weight Block: Defiant™ LRG Core (Asymmetrical) Color: Citrine/Rhodonite/Jet Review: The Gem series has been a home run for that first out of bag bowling ball and not to mention the awesome shelf appeal! If you love those bowling balls that like to move this will not disappoint. Our style: tweener, 350-375 revs, 16.5mph, layout of choice is 4x4x2 (pin is above bridge). We really like this ball for fresh tournament and house patterns. We often find ourselves beginning with this piece in game 1 and transitioning to something a little smoother down lane in the later part of game 2 and game 3. This ball may not be as versatile as some of the other SPI asym bowling balls but it must not be overlooked for its power on the fresh. It really is a true Gem. This may be more of a niche piece but it is definitely worth checking out at a local matchmaker to see if it fills that Magic gap in your arsenal! Kyle, Joel, & Dean Johnson Roto Grip Pro Shop Staffers #SquadRG

  • 5
    Roto Grip Magic Gem

    Posted by Curtiss on Nov 1st 2023

    Coverstock: MicroTrax Hybrid Reactive Finish: 2000 Grit Abralon Core: Defiant LRG Core RG: 2.50 Differential: 0.052 Int Diff: 0.015 The Magic Gem is the Gem I have been waiting for. Being a high Rev player, I was not able to use my GEM very often as it would hook too early to play right with but would burn up when I moved inside. The Exotic Gem just pushed a little too much for me in oil but would over hook when it hit a lot of friction. The Magic Gem pushes through the fronts more than the GEM but picks up more in the midlane than the Exotic. The backend on this Magic Gem is more for me than either of the other Gems. This ball seems very similar to the Reality but picks up slightly earlier. I could see this being a ball I have 2 of, 1 having surface and 1 being polished, as it is very versatile.

  • 5
    Roto Grip Magic Gem review by Chris Pollentier

    Posted by Chris Pollentier on Oct 31st 2023

    Roto Grip Magic Gem Coverstock: MicroTrax Hybrid Reactive Finish: 2000-grit Abralon Core: Defiant LRG Core RG: 2.47, Diff: 0.053, PSA: 0.016 (15 lb.) VLS Layout: 5 x 5 x 2 Dual Angle Layout: 65 x 5 x 30 PAP: 5 3/16” right x 5/8” up Rev rate: 400 rpm Average speed: 16.5 mph Location: Prairie Lanes, Sun Prairie WI Pattern: Medium volume THS The Roto Grip Magic Gem is the newest addition to the Gem series, this time featuring the hybrid MicroTrax cover that’s 2-parts pearl and 1-part solid and wrapped around the ever-familiar Defiant LRG core. The intent with this release was to compliment the reactions of the original Gem and Exotic Gem by slotting between those two balls – a little cleaner through the fronts than the Gem but with more midlane read than the Exotic Gem. After my first few shots, it was clearly evident that the Magic Gem is a very aggressive ball that is more continuous downlane than the Gem, and thanks to the 2000-grit Abralon hybrid cover it picks up and reads the body of the oil pattern better than the Exotic. I threw the Magic Gem after the Saturday morning junior league, and even though there was a fair amount of carry down from the kiddos, I was still forced to move further left than expected to find enough oil to get the ball down the lane. To my eye, the Magic Gem creates a strong and powerful reaction that’s more reminiscent of the Gem, but the Magic manages to be a bit cleaner and creates more downlane motion that better drives through the pins. The Exotic Gem or Clone would be a good option to ball down to when the Magic Gem becomes too strong. I expect the Magic Gem to be a great ball for blending out the over/under reaction you typically see on league house patterns. It’s super strong out of the box, but I suspect it will become more versatile as it lane-shines after a few games or by adjusting the surface with a 3000- or 4000-grit Abralon pad so that it doesn’t dig so hard into the oil. I see the Magic Gem as being my go-to for heavier volume patterns when I need a bit more shape than what the OG Gem is capable of. If you’re looking for a ball with a powerful and aggressive reaction, there’s no need to look further than Magic Gem. Chris Pollentier Storm Pro Shop Staff #StormNation #SquadRG

  • 5
    Magic Gem!

    Posted by Josh Shoemaker on Oct 29th 2023

    The Roto Grip Magic Gem is the newest HP4 ball to hit the SPI line. The Magic Gem features the MicroTrax hybrid cover that’s wrapped in the same Defiant LRG core that was featured in the GEM and Exotic before. The Magic Gem for me is the perfect step down from the original when I need slightly less traction and more overall shape. The Magic Gem is the perfect compliment to the Reality, being slightly cleaner and faster. Review Video: (

  • 5
    Magic Gem

    Posted by Michael Slatky on Oct 29th 2023

    Roto Grip Magic Gem Coverstock: MicroTrax Hybrid Reactive Finish: 2000 Grit Abralon Core: Defiant LRG Core (14 pd) RG: 2.50 Differential: 0.052 Int Diff: 0.015 Layout: 5 x 4 1/2 x 3 1/4 - 2LS Layout Extras: 2 3/4 Finger Depth, "X" - 4 1/2 D and 1 Inch Left Tester: PAP 6 1/2 R, 1 1/4 D Review: The Magic Gem features the MicroTrax Hybrid Reactive coverstock which makes the Magic Gem distinctive in the Roto Grip and SPI line of bowling balls. The original Gem is noted as the earliest rolling ball at the current time. The two part pearl one part solid makes up the Magic Gem. Although the Magic Gem will provide the bowler extra length, you can expect the Magic Gem to also give you more reaction when the ball encounters friction compared to the Gem. Anything you desire in a ball to create hook, more hook, oh and can you say "hook!". This one is for you. You should expect an early continuous, strong reaction. The best part is the Magic Gem will provide continuous lane motion early on, yet provide great control. The Magic Gem achieves some length so the ball does not "hook at your feet" which would have occurred with older generation of bowling balls. The Magic Gem will work best on long, medium and higher volume patterns. If your desire is to stay left before and as the the lanes transition this ball will not disappoint. If you want the biggest, aggressive and most powerful hybrid on the market today in your bag, this is the one! Don't hesitate to try out the Roto Grip Magic Gem today. Michael Slatky 900 Global Staff Member York, PA

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