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
UMP Gen4T
Core
Catback
Symmetric
Factory finish
500, 1000, 2000 Abralon®
Color
Red / Yellow / Blue
Released
Not listed
USBC
Approved 2010-09-01
Weights and specs
Weight
RG
Differential
Int. diff
14 lb
2.53
0.045
—
15 lb
2.52
0.052
—
16 lb
2.56
0.046
—
Surface
Coarse grit
Coarse and fine
Fine grit or polish
500, 1000, 2000 Abralon®. Sanded then smoothed (1500 to 3000 grit): enough tooth for oil, enough gloss to get down the lane. Most box finishes. Surface changes over games, and a pro shop can take any ball either way with a pad.
