Ten-pin bowling regulations, identification letters and numbers, and general wear from normal use. For much of the history of bowling, bowling balls were made using a three-piece construction method. Starting in the mid-1990s, however, most manufacturers switched to a two-piece method. In response to these innovative ball designs, the American Bowling Congress placed further restrictions on the technical characteristics of the ball such as the radius of gyration and hooking potential. A game of bowling consists of ten frames. In each frame, the bowler will have two chances to knock down as many pins as possible with their bowling ball. In games
Five-pin bowling no fingerholes, although the Canadian 5 Pin Bowlers Association (C5PBA) have approved balls with thumb holes made by one manufacturer (the E. Parrella Co., known as EPCO). At the end of the lane there are five pins arranged in a V. In size they are midway between duckpins and ten pins, and they have a heavy rubber band around their middles, similar to the pins used in the rarely seen "rubberband duckpin" form of duckpin bowling, to make them move farther when struck. Unlike any other form of bowling popular in North America, the pins in five-pin bowling are worth