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Pyramid Blueprint Pearl Project 1.618

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

How it moves

Foul lineArrows · 15 ft46 ft · board 76.5° entry
Arcing turn (symmetric 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.
Pyramid

Blueprint Pearl Project 1.618

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
GPS Navigational Pearl
Reactive pearl
Core
SG 19.5 Symmetric
Factory finish
2000 Abralon, Factory Finish Polish
Color
Not listed
Released
2015-11-11
USBC
Approved

Weights and specs

WeightRGDifferentialInt. diff
15 lb2.530.050—

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
2000 Abralon, Factory Finish Polish. 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.