Photo and specs courtesy of bowling.com. Reproduced with credit to the maker.
How it moves
Arcing turn (symmetric 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.
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
GTR IV Hybrid
Reactive hybrid
Core
Widow Nasty
Factory finish
Not listed
Color
Black / Gold Pearl
Released
2015-06-01
USBC
Approved 2015-05-01
Weights and specs
Weight
RG
Differential
Int. diff
15 lb
2.56
0.054
—
Surface
Coarse grit
Coarse and fine
Fine grit or polish
Coarse surfaces grip through oil and hook early; fine or polished surfaces skid longer and hook later. Surface changes over games, and a pro shop can take any ball either way with a pad.
Reviews on YouTube
Bowltech Danmark · 2015 · Hammer Spike Black/Gold
Picked by search for this ball; videos and thumbnails belong to their creators and play on YouTube.
