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Old June 29th, 2010, 01:46   #43
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Join Date: Jan 2008
Location: Scarbrah, Ontario
I'd say they are made of the same material as Billiard balls

From ehow

Since then, the manufacturing of billiard balls has seen many improvements. A billiard ball is now made out of unsaturated polyester resins and calcium carbonate reacted with an organic peroxide catalyst.
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