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
Bowling pin Bowling pin Bowling pins are the target of the bowling ball in various bowling games including tenpins, five-pins, duckpins, and candlepins. Pin specifications are set by the United States Bowling Congress (USBC). World Bowling, formerly World Tenpin Bowling Association, has adopted the USBC specifications. Pins are wide at their widest point and tall. They weigh , pins weighing up to are approved. The weight of the pin was originally based on the idea that a single pin should be around 24 percent the weight of the heaviest bowling ball within regulation, . Duckpins are shorter and squatter than standard tenpins.