# Roto Grip Rst X-4

> Bowling ball — data from CarryDown (https://www.carrydown.com/balls/roto-grip-rst-x-4/)

- Brand: Roto Grip
- Last updated: 2026-08-03
- Availability: unknown
- Released/approved: 2023-06-14
- Coverstock: [MicroTrax Pearl Reactive](https://www.carrydown.com/brands/roto-grip/coverstocks/microtrax/) (pearl)
- Core: [RST Core (Roto Star Tour Core)](https://www.carrydown.com/brands/roto-grip/cores/rst-core-roto-star-tour-core/)
- Intended condition: Medium-heavy oil
- Factory finish: 1500-grit Polished
- Flare potential: High
- List price (MSRP): no manufacturer price found
- USBC approved: yes (2023-06-06)

## Specs by weight

| Weight | RG | Differential | Int. Diff |
|---|---|---|---|
| 16 lb | 2.52 | 0.049 | 0.015 |
| 15 lb | 2.53 | 0.053 | 0.016 |
| 14 lb | 2.55 | 0.053 | 0.016 |
| 13 lb | 2.57 | 0.032 | 0.01 |
| 12 lb | 2.59 | 0.029 | 0.008 |

## International listings

- Japan — [HI-SPORTS](https://hi-sp.co.jp/product/rst-x-4/) — [spec sheet PDF](https://hi-sp.co.jp/2019new/wp-content/uploads/2023/11/bo436-rst_x-4-ctlg.pdf)
- South Korea — [Bowling Korea](https://www.bowlingkorea.com/balls/566)