# Roto Grip GEM

> Bowling ball — data from CarryDown (https://www.carrydown.com/balls/roto-grip-gem/)

- Brand: Roto Grip
- Availability: discontinued
- Released/approved: 2022-03-11
- Coverstock: [Micro Trax Solid](https://www.carrydown.com/brands/roto-grip/coverstocks/micro-trax/) (solid)
- Core: [Defiant LRG](https://www.carrydown.com/brands/roto-grip/cores/defiant-lrg/) (asymmetric)
- Intended condition: Heavy oil
- Factory finish: 2000 Grit
- Flare potential: High
- USBC approved: yes (2022-01-04)
- PBA certified: yes

## Specs by weight

| Weight | RG | Differential | Int. Diff | Mass Bias |
|---|---|---|---|---|
| 16 lb | 2.47 | 0.051 | 0.016 | — |
| 15 lb | 2.47 | 0.053 | 0.016 | — |

## Description

GEM