Photo and specs courtesy of bowling.com. Reproduced with credit to the maker.

How it moves

Straight (spare ball). Dotted is skid, then the turn, then the roll into the pocket. Estimated from the coverstock, finish, core, and differential for a right-handed bowler with medium revs on a house shot. Lane conditions, speed, and layout move all of this.

Roto Grip

Cosmos

Hook potential1 (est.)1 of 10, estimated

How much the ball wants to hook, 1 (straight, a spare ball) to 10 (the strongest oil-eaters). The maker publishes no number for this ball, so this is estimated from the coverstock, core, finish, and differential.

Coverstock: Polyester; Polyester
Core: Traditional 3-Piece Core
Factory finish: 3500-grit Polished
Color: Sky/Admiral/Teal
Released: 2026-07-01
USBC: Approved 2002-09-01

Weights and specs

Weight	RG	Differential	Int. diff
15 lb	2.69	—	—

Surface

Coarse grit

Coarse and fine

Fine grit or polish

3500-grit Polished. Skims the oil and saves its energy for the dry part of the lane: longer skid, later and sharper hook. Polished and pearl balls. Surface changes over games, and a pro shop can take any ball either way with a pad.

Reviews on YouTube

DH Bowling · 2022 · ROTO GRIP IDOL COSMOS | Ball Review By DH Bowling (Darren Alexander)

JR Pro Shop · 2022 · ENOUGH HOOK FOR A TWO HANDER? | Roto Grip Idol Cosmos Ball Review | Phaze 2 & Obsession Tour Pearl

EMAX Bowling Service · 2022 · Roto Grip Idol Cosmos Bowling Ball Review | PBA Pro Thomas Larsen

Picked by search for this ball; videos and thumbnails belong to their creators and play on YouTube.