Photo and specs courtesy of Storm. 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.
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
U1S Urethane Pearl
Urethane
Core
3 Piece
Symmetric
Factory finish
3500 Grit Polished
Color
Black/Silver
Released
2015-06-30
USBC
Approved
Weights and specs
Weight
RG
Differential
Int. diff
16 lb
2.68
0.006
—
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.
