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Roto Grip Exotic Gem

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

How it moves

Foul lineArrows · 15 ft52 ft · board 8.59.2° entry
Hockey-stick turn (asymmetric core). 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

Exotic Gem

Discontinued
Hook potential5 (est.)5 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
MicroTrax Pearl
Reactive pearl
Core
Defiant LRG
Asymmetric
Factory finish
Reacta Gloss
Color
Citrine/Apatite/Amethyst
Released
2022-12-09
USBC
Approved 2022-09-13

Weights and specs

WeightRGDifferentialInt. diff
12 lb2.590.0290.008
13 lb2.570.0320.010
14 lb2.500.0520.015
15 lb2.470.0530.016
16 lb2.470.0510.016

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
Reacta Gloss. 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.

Balls like this

Same coverstock and core type; the closest company for this ball in a bag.