A bowling ball is a heavy, spherical object used in the sport of bowling. Typically made of plastic, urethane, or reactive resin, it has three holes drilled into it for gripping. Bowling balls come in various weights, usually ranging from 6 to 16 pounds, allowing players to choose one that suits their strength and style. When rolled down a bowling lane, the goal is to knock down a set of ten pins arranged in a triangular formation. The design of the ball, including its weight and surface texture, affects its trajectory and spin, influencing the player's ability to achieve strikes and spares.