This bowling ball ships pre-drilled. There are 5 sizes and the sizes that we drill are based on the weight of the ball. X-Small: 6lbs- Ages 8 and under, Small: 8lbs and 9lbs- Ages 8-11 and womens ring size from 8-11, Medium: 10lbs, 11lbs, and 12lbs, Ages 11-15 and Adult Ring size 10 or lower, Large: 13lbs and 14lbs, Mens ring size 10-12 or people with larger hands, X-Large: 15lbs and 16lbs, Mens ring size over 13 or people with extremely large hands. If you would like a different size drilled for the weight you selected, you must contact us via email as soon as your order is placed with your order number. pre-drilled bowling balls cannot be returned or exchanged. It's always good to have a spare. And with T-Zones being so affordable, you can. Just pick your favorite color, or two, or three. Great Ball for Kids, Beginners and Spare Shooting. This ball glows under the black light. Picture two shows what it looks like under the black light. Coverstock: Plastic/Polyester Ball Color: Many Colors Available- Product color of this ball is listed in the title of this ball Ball Finish: High Gloss Polish Hook Potential: 25 (Low) on a scale of 10-175 Low-High Recommended Lane Conditions: Any