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Brunswick Ultimate Defender

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

How it moves

Foul lineArrows · 15 ft46 ft · board 57° 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

Ultimate Defender

Discontinued
Hook potential7.5 (est.)7.5 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
HK22 - A.C.T. 3.0 Hybrid
Reactive hybrid
Core
Portal X
Asymmetric
Factory finish
500, 2000 Siaair Micro Pad
Color
Violet / Pink / Navy
Released
2024-02-22
USBC
Approved 2024-02-05

Weights and specs

WeightRGDifferentialInt. diff
12 lb2.590.0410.014
13 lb2.600.0410.014
14 lb2.500.0540.015
15 lb2.470.0540.015
16 lb2.490.0460.013

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
500, 2000 Siaair Micro Pad. 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.

Balls like this

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