Picture of Roto Grip Perfect Gem Bowling Ball

Picture of Roto Grip Perfect Gem Bowling Ball

Picture of Roto Grip Perfect Gem Bowling Ball

Picture of Roto Grip Perfect Gem Bowling Ball

Roto Grip Perfect Gem Bowling Ball

E-R1 Solid Reactive cover, GEM + A.I. (asymmetric) core. Best for medium-heavy to heavy oil.

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Manufacturer: Roto Grip

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Old price: $289.95

Price: $199.95

The Perfect Gem is the cleaner, stronger evolution of the Gem: the low-RG, high-differential GEM + A.I. core under the new E-R1 solid.

Coverstock: E-R1 Solid Reactive
Core: GEM + A.I. (asymmetric)
Specs: 2.49 RG, .057 differential, .017 mass bias (15 lb)
Factory finish: 2000 Grit Abralon
Best for: Medium-heavy to heavy oil
Weights: 12 to 16 lb
Sold undrilled