What cover and core does the Roto Grip Perfect Gem use?
Roto Grip Perfect Gem Bowling Ball
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Open Oct 08, 2026 - 02:17 PM
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Staff Answer
Oct 08, 2026 - 02:17 PM
The Perfect Gem pairs Roto Grip's new E-R1 Solid Reactive coverstock, a nano-free formula finished at 2000-grit Abralon, with the asymmetric GEM A.I. Core. At 15 pounds the core measures a 2.49 RG, a .057 differential and a .017 intermediate differential, per the manufacturer's specs.
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Roto Grip Perfect Gem Bowling Ball
What should I know about the Perfect Gem? • Asymmetric GEM + A.I. Core: low 2.49 RG and a massive .057 differential for heavy flare • All-new nano-free E-R1 Solid Reactive cover at a 2000-Grit Abralon finish • The cleaner, stronger, more continuous evolution of the Gem for medium-heavy to heavy oil
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