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Brunswick Ultra Zone

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

How it moves

Foul lineArrows · 15 ft52 ft · board 710.7° 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.
Brunswick

Ultra Zone

Discontinued
Hook potential6 (est.)6 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
EnMotion
Reactive pearl
Core
Updated Phantom
Asymmetric
Factory finish
Polished
Color
Not listed
Released
2008-02-05
USBC
Approved 2008-01-01

Weights and specs

WeightRGDifferentialInt. diff
12 lb2.640.0440.014
13 lb2.620.0440.014
14 lb2.530.0440.020
15 lb2.500.0460.020
16 lb2.480.0460.020

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
Polished. 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.