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 Coverstock: Plastic/Polyester Ball Color: Many Colors Available- Product color of this ball is listed in the title of this ballBall Finish: High Gloss Polish Hook Potential: 25 (Low) on a scale of 10-175 Low-High Recommended Lane Conditions: Any