House Bowling Balls
The maximum diameter of the bowling ball is 8.595 inches (21.83 cm) and the circumference of the ball must not be more than 27 inches (0.69 m), and the ball cannot weigh more than 16 pounds (7.26 kg). Generally, the lightest ball available for use is 6 pounds (2.72 kg). The ball must have a smooth surface over its entire circumference except for holes or indentations used for gripping the ball, holes or indentations made to bring the ball back into compliance with weight-distribution regulations, identification letters and numbers, and general wear from normal use.
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