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Any of the balls used in billiards

Cue balls from (left to right):

• Russian pyramid and kaisa—68 mm ( 2+11⁄16 in)
• Carom—61.5 mm ( 2+7⁄16 in)
• International pool—57.15 mm ( 2+1⁄4 in)
• Snooker—52.5 mm ( 2+1⁄16 in)
• British-style pool—51 mm (2 in)

Any of the balls used in billiards

Hyatt's celluloid ball patent (1871)

Any of the balls used in billiards

Carom balls. Four-ball needs an additional object ball.