Synthetic (not a natural rock)

Bowling Ball (Brunswick T-Zone Deep Space)

Polyester resin / Polyurethane polymer

Hardness: Shore D 73-75; Color: Purple/Blue galaxy pattern with silver glitter; Luster: High-gloss resin finish; Structure: Solid spherical mass about 8.5 inches in diameter; Weights vary from 6-16 lbs.

Hardness: Shore D 73-75
Color: Purple/Blue galaxy pattern with silver glitter
Luster: High-gloss resin finish

Identified March 22, 2026More synthetic (not a natural rock) →

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Physical properties

Formation & geological history

Modern industrial manufacturing; created using a molding process where polyester resin is poured into a spherical mold, cured with chemicals, and then lathed to a smooth finish.

Uses & applications

Used specifically for ten-pin bowling, primarily as a 'spare' ball or for beginners due to its low hook potential.

Geological facts

The T-Zone series is one of the most popular lines of plastic bowling balls in history; the 'Deep Space' colorway is designed to mimic a nebula or cosmic scene.

Field identification & locations

Can be identified in the field by the 'T-Zone' logo and the three drilled finger holes (if already customized). Commonly found in bowling alleys or sporting goods stores.

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