Photo and specs courtesy of Track. 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
MP Gen 4 Reactive Pearl
Reactive pearl
Core
What makes the 508A an improved version of the 505A? First we started with the e
Symmetric
Factory finish
The 508A also brings a different surface than the 505A as now we use three diffe
Color
Green / Black / Yellow
Released
Not listed
USBC
Approved 2011-12-01
Weights and specs
Weight
RG
Differential
Int. diff
14 lb
2.53
0.047
—
15 lb
2.51
0.049
—
16 lb
2.53
0.041
—
Surface
Coarse grit
Coarse and fine
Fine grit or polish
The 508A also brings a different surface than the 505A as now we use three diffe. Bites through heavy oil, so the ball reads the lane early and hooks sooner. Sanded balls (500 to 1000 grit) live here. Surface changes over games, and a pro shop can take any ball either way with a pad.
