Rack (billiards) ball, the ball is placed on the highest available spot. If there is no available spot, it is placed as close to its own spot as possible in a direct line between that spot and the top (black end) cushion, without touching another ball. If there is no room this side of the spot, it will be placed as close to the spot as possible in a straight line towards the bottom cushion, without touching another ball. Rack (billiards) A rack (sometimes called a triangle) is a piece of equipment that is used to place billiard balls in their starting
Carom billiards have a higher light sensitivity to green than to any other color, so green cloth permits play for longer periods of time without eye strain. Modern billiard balls are made from highly resilient plastics with a typical diameter of . They are significantly larger and heavier than their pocket billiards counterparts, ranging between with a typical weight of . While UMB, the International Olympic Committee-recognized world carom billiards authority, technically permits balls as small as , no major manufacturer produces such balls any longer, and the "de facto" standard is . The three standard balls in most carom billiards games