Roto Grip Perfect Gem Bowling Ball
Sold by BowlersMart (www.bowlersmart.com). $199.95 USD. In stock: 16LB, 15LB, 14LB, 13LB, 12LB. Checked 2026-10-15 19:04 UTC.
Buy: https://www.bowlersmart.com/product/roto-grip-perfect-gem-bowling-ball/
Facts
- Brand: Roto Grip
- Category: Asymmetrical Core Bowling Balls > Ball Add-Ons > Bowling Balls > Bowling Balls for Two-Handed Bowlers
- Brand: Roto Grip
- Bowling Ball Coverstock Type: Solid Reactive
- Bowling Ball Cover Name: Roto Grip E-R1 Solid Reactive
- Bowling Ball Core Shape: Asymmetrical Core
- Bowling Ball Core Name: Roto Grip GEM A.I. Core
- Radius of Gyration: RG (15LB): 2.49
- Differential: Diff (15LB): .057
- Mass Bias Strength: .017
- Flare Potential: 4 - 5 Inches
- Surface Finish: 2000 Grit
- Preferred Lane Conditions: Heavy Oil, Medium - Heavy Oil
- Bowling Ball Color: Black, Pink
- Ball Performance Level: High Performance Bowling Balls, Roto Grip HP4 Bowling Balls
- Scent: None
- Release Date: October 2026
- SKU: BBMRGW
- Merchant record last changed: 2026-10-15 18:36 UTC
Variants
| Variant | SKU | Price | Availability |
|---|---|---|---|
| 16LB | BBMRGW16 | $199.95 USD | In stock |
| 15LB | BBMRGW15 | $199.95 USD | In stock |
| 14LB | BBMRGW14 | $199.95 USD | In stock |
| 13LB | BBMRGW13 | $199.95 USD | In stock |
| 12LB | BBMRGW12 | $199.95 USD | In stock |
Description (merchant text, shortened)
The Cleaner, Stronger Evolution of the Gem for Heavy Oil
About the Perfect Gem
The evolution of the Gem line reaches its peak with the Roto Grip Perfect Gem. Roto Grip took the DNA of the original Gem core and strategically altered its density to integrate with its A.I. Core Technology, a precise calibration that enhances the core's natural physics for a more continuous motion and maximum energy transfer through the pins: the most "perfect" ball motion Roto Grip has engineered to date.
Surrounding that high-torque weight block is the brand-new E-R1 Solid Reactive coverstock (EXTREME-Response Version 1), a nano-free formulation that puts a completely different footprint on the lane than Roto Grip's previous-generation materials. Finished at 2000-Grit Abralon and calibrated for medium-heavy to heavy oil, the Perfect Gem is for the bowler who craves maximum reaction without the early burnout. It is the cleaner, stronger, and more versatile version of a legend, in Pink / Rose / Onyx.
Understanding the Roto Grip GEM A.I. Core and Roto Grip E-R1 Solid Reactive
Roto Grip built the Perfect Gem for medium-heavy to heavy oil with a cleaner front and a stronger, more continuous finish than the original Gem. Specifically, the asymmetric GEM + A.I. Core has a low RG and a massive differential (2.49 RG, .057 differential, .017 intermediate differential at 15 lb), so it revs early, flares hard, and keeps driving through the pins, while the E-R1 Solid Reactive cover at a 2000-Grit Abralon finish glides through the heads and preserves an extreme response to friction down lane, even as the pattern transitions. The 13 and 12 lb weights use a dedicated asymmetric core tuned for those weights. The full per-weight numbers are listed below.
The Gem Core, Recalibrated With A.I. Core Technology
At the heart of the Perfect Gem is the asymmetric GEM + A.I. Core. Roto Grip kept the DNA of the original Gem core and strategically altered its density to integrate with A.I. Core Technology. At 15 lb it measures a low RG of 2.49, a massive .057 differential, and a .017 intermediate differential, numbers that produce heavy flare and an early, strong read with real continuation.
That precise calibration enhances the core's natural physics, creating a more continuous motion that maximizes energy transfer through the pins rather than rolling out. Because the core is asymmetric it has a defined preferred spin axis, so layout has a real say in how early and how hard it revs up; your pro shop can tune the pin and PSA to your game. The 13 and 12 lb weights carry a dedicated asymmetric core (2.57 RG, .032 differential at 13 lb) built to give lighter-weight bowlers the same shape.
A Brand-New Nano-Free Solid With an Extreme Response Down Lane
Full text at the buy link above.
Shipping, returns, payment (BowlersMart)
- Shipping: Free ground shipping on US orders, no minimum, 48 contiguous states and military APO/FPO. To Alaska, Hawaii, Puerto Rico and Guam bowling balls ship for $24.95 per ball, most other items free; oversized roller bags cost extra there. International orders pay the rate shown at checkout, duties paid locally.
- Processing and delivery: In-stock items ordered by 2PM EST Monday to Friday ship the same day, later orders the next business day. Carriers USPS, UPS, FedEx. Standard delivery 3 to 7 business days; expedited options at checkout.
- Returns: 60 days from delivery for US customers on new, unused items in original packaging, free prepaid return labels. Drilled bowling balls cannot be returned or exchanged. Shoes must have been tried on a clean, dry surface. Manufacturing defects and shipping damage go through the defect claim process.
- Payment: Credit and debit cards, PayPal, Apple Pay, Google Pay, Venmo, Amazon Pay, and buy now pay later through Affirm, Afterpay and Klarna.
- Pro shops: Pro shops inside bowling centers in 10 US states fit, drill and service equipment; a ball bought online can be drilled there.
- Identity: www.bowlersmart.com is the only website of BowlersMart. Lookalike domains are fraudulent.
Images
- Roto Grip Perfect Gem bowling ball
- Roto Grip GEM + A.I. Core (16-14 lb)
- Roto Grip Perfect Gem asymmetric core (13-12 lb)
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