Chapter 5, Section F
Bowling balls are made of non-metallic composition material, usually with a base compound of either rubber or plastic, or some instances, a combination of both. The circumference of a bowling ball is approximately 27 inches, and the diameter approximately 8.59 inches. Bowling balls can weigh no more than 16 pounds.
At the present time there is no minimum weight prescribed, although the lightest ball currently manufactured is approximately 6 pounds and is used almost exclusively by children or disabled persons. The most common weights manufactured vary from 10 pounds to 16 pounds. Present regulations limit the number of holes that can be drilled to only those necessary for gripping and delivering the ball, with at for positioning two (2) different grips on the same ball. One hole is at for balancing purposes and vent holes to the finger and/or thumb holes not to exceed 1/4 inch in diameter, and one hole for inspection purposes not to exceed 5/8 in diameter and 1/8 in depth. Most bowlers use a 3 hole ball, although some find it more comfortable to have the additional holes drilled for other fingers. This is quite common with individuals who have arthritis, or have suffered some injury to the hand or arm.
All Information on this website came from ABBA website
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