Red Haired Girl At The Billiard Table

The purpose of the cushion rubber is to cause the billiard balls to rebound off the rubber while minimizing the loss of kinetic energy.
When installed properly the distance from the nose of the cushion to the covered slate surface is 1 7/16" while using a regulation 2 1/4" ball set.
The profile of the rail cushion, which is the cushion's angle in relation to the bed of the table, varies between table types. The standard on American pool tables is the K-66 profile, which as defined by the BCA has a base of 1-3/16 inches and a nose height of 1 inch . This causes the balls' rebound to be somewhat predictable during game play.
On a carom table, the K-55 profile is used (with a somewhat sharper angle than pool cushions). K-55 cushions have cloth, usually canvas, vulcanized into the top of the rubber to adjust rebound accuracy and speed .