Roto Grip Perfect Gem
Roto Grip Perfect Gem bowling ball
Roto Grip GEM + A.I. Core (16-14 lb)
Roto Grip Perfect Gem asymmetric core (13-12 lb)
Heavy Oil High Performance HP4

Roto Grip Perfect Gem

Video review coming soon

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

Arsenal Position
Heavy Dry
$199.95
Free shipping • 60-day returns • Striking Rewards eligible
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Coverstock
Solid Reactive
Core
Asymmetric
RG
2.49
Differential
.057
Weights
12LB, 13LB, 14LB, 15LB, 16LB
Finish
2000 Grit

What the Specs Tell Us

The Roto Grip E-R1 Solid Reactive coverstock offers strong traction in oil, reading the midlane early for a smooth, controlled arc. With an RG of 2.49 and a .057 differential, this core revs up earlier for a stronger midlane read with strong flare potential that creates an aggressive ball motion. Designed for heavy oil, this ball has the surface and core combination to handle the volume and still make a move to the pocket.

Technical Specifications

Full Specifications
Brand Roto Grip
Ball Name Perfect Gem
Coverstock Roto Grip E-R1 Solid Reactive
Coverstock Type Solid Reactive
Core Name Roto Grip GEM A.I. Core
Core Type Asymmetric
RG (15 lb) 2.49
Differential .057
Mass Bias .017
Factory Finish 2000 Grit
Lane Condition Heavy Oil
Available Weights 12LB, 13LB, 14LB, 15LB, 16LB
Color Black, Pink
Release Date October 2026
SKU BBMRGW

Similar Balls with Video Reviews

4.0 out of 5from 1 verified review

Customer Reviews

4.0 (1 reviews)
Zachary Woelfel

The Perfect Gem gives me exactly what I’m looking for when I need a strong, confident reaction on heavier conditions. It digs into the lane early, gives me a strong and predictable midlane read, and still has plenty of continuation through the pins. Compared to the Original Gem, I see a little more continuation downlane while still getting that strong overall motion the Gem line is known for. Compared to the Magic Gem, the Perfect feels smoother and more predictable for me, especially when I need to control the breakpoint. It fits nicely between the two and gives me a shape that I feel like I can use on a wider variety of heavier conditions. When there’s enough volume and I need something strong, smooth, and dependable, the Perfect Gem is an easy choice.

Mon, 21 Sep 2026 14:07:21 GMT
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