In the columns marked OIL-MEDIUM-DRY-SPORT, you see S-T-C this refer's to Strokers-Tweeners-Crankers. BTM has a ball tester for each catagory.
(stats on the bowlers can be found in the magazine)
The numbers reflect the opinions of the testers on how the balls reacted on the four different "fresh conditions" on a scale of 1-10.
1-3 is below average performance, 4-6 is average performance and 7-9.5 is excellent performance.
So if your a Stroker, a Tweener or a Cranker, you'll look under the listing that match's you. If your not into all the technical aspect's of balls, just stick to these numbers.
As for the other numbers basically these numbers are how the BTM rated them and may not be the same as the ball company numbers.
Box finish is what the Out of Box (O.O.B.) surface is from the factory.
Hook 1-100 bigger the number the more it hooks.
Backend 1-20 bigger the number the stronger the backend reaction.
Length 1-25 bigger the number the farther it goe's down the lane before it reacts.
Torque 1-10 The flippiness of the ball, bigger the number more flippy it is, smaller number the more even at the breakpoint it is.
Diff/Flare 1-10+ -bigger the number more flare.
RG 1-10+ basically lower numbers are more early revving, higher the number the ball revs later.
Load refers to the particle content of the coverstock on Particle balls.
