1) Alley roller 2) It can be gutterbound 3) It has holes 4) It may end up in the gutter 5) It might end up in the gutter 6) Tenpins need 
A bowling ball is a piece of sporting equipment used to hit bowling pins in the sport of bowling. Ten-pin bowling balls are typically hard spheres with three holes drilled in them, one each for the ring and middle fingers, and one for the thumb. Regulating bodies such as the USBC maintain requirements for the properties of bowling balls, including...
[n] - a large ball used for bowling
noun a large ball with finger holes used in the sport of bowling
a round, heavy ball for bowling, usually made of hard rubber or plastic, with holes drilled into it for the bowler's thumb and two fingers.