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Track Theorem Pearl

Photo and specs courtesy of Track. Reproduced with credit to the maker.

How it moves

Foul lineArrows · 15 ft48 ft · board 5.58.5° entry
Hockey-stick turn (asymmetric 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.
Track

Theorem Pearl

Discontinued
Hook potential7 (est.)7 of 10, estimated

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
Prime Response Pearl (HK22)
Reactive pearl
Core
MC2 Asym
Asymmetric
Factory finish
500, 1000, 1500 Siaair / Factory Compound
Color
Purple / Blue / Sky Blue
Released
2024-11-21
USBC
Approved 2024-11-05

Weights and specs

WeightRGDifferentialInt. diff
12 lb2.590.0410.014
13 lb2.600.0410.014
14 lb2.490.0460.017
15 lb2.470.0460.017
16 lb2.480.0440.017

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
500, 1000, 1500 Siaair / Factory Compound. 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.

Balls like this

Same coverstock and core type; the closest company for this ball in a bag.