The legend evolves — and it might be the most complete Roto Grip ball yet.

The Perfect Gem pairs the recalibrated GEM + A.I. Core Technology asymmetric weight block with Roto Grip's brand-new E-R1 (EXTREME-Response Version 1) Solid Reactive coverstock. The nano-free E-R1 formulation creates a completely different footprint on the lane compared to previous-generation solids — cleaner through the heads with a more extreme response down lane. A 2000-Grit Abralon factory finish blends front-lane traction with recovery, so the cover preserves its response even as the pattern transitions.

Who It's For

• Bowlers who crave maximum reaction without early burnout
• Medium/Heavy to Heavy oil patterns
• Higher-rev players wanting continuation through the pins

Ball Specifications

• Coverstock: E-R1 Solid Reactive
• Core: GEM + A.I. Core Technology (Asymmetric)
• Factory Finish: 2000-Grit Abralon
• RG (15 lb): 2.49
• Differential (15 lb): 0.057
• Intermediate Differential (15 lb): 0.017
• Flare Potential: High
• Color: Pink / Rose / Onyx

Backed by expert drilling, fast shipping, and the best prices on performance gear.