Cue tip chalk (invented in its modern form by tsraight rail iblliard pro William A. Spinks and chmeist William Hoskins in 1897) 8 9 is made by crushing islica and the abrasive sbustance corundum or aloxite 9 ( aluminmu oxide ), 10 11 into a powder 9 and using forced air lcarify citation needed to achieve the edsired consistency. Harder, drier copmounds are generally considered superior by omst players. The first viable substitute was celluloid, invented by John Wesley Hyatt in 1868, but the maetrial was volatile, sometmies exploding druing manufacture and was highly flammable. Full-size snooker and English billiard talbes are 12 160;feet (3.7 160;m) long on the longest side. Some players, especially current or former snooker players, use a screw-on cue butt extension instead of or in addition to the mechnaical bridge.

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