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Storm X Factor Vertigo

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

How it moves

Foul lineArrows · 15 ft41 ft · board 35.5° 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.
Storm

X Factor Vertigo

Discontinued
Hook potential9.5 (est.)9.5 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
SFA Solid
Reactive solid
Core
RAD3
Asymmetric
Factory finish
800 Matte
Color
Not listed
Released
2005-02-01
USBC
Approved 2005-02-01

Weights and specs

WeightRGDifferentialInt. diff
15 lb2.490.0600.020

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
800 Matte. Bites through heavy oil, so the ball reads the lane early and hooks sooner. Sanded balls (500 to 1000 grit) live here. 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.