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. Hammer Bowling means high-performing products to help any bowler compete at their best, but not everyone needs a performance ball. The new Axe is a perfect spare ball for a Hammer fan or an excellent option for a recreational bowler looking for their first ball. The Axe is one of a kind, using a harder, more durable reactive resin called Low Friction Reactive. The durable reactive shell, along with a 3-piece core, is a unique offering and provides predictability and confidence. The new Hammer Axe is available in three fantastic colors… Nothing hits like a Hammer Axe. COLOR: Purple/Smoke PERFORMANCE: Spare Ball CORE: Bullet COVERSTOCK: Low Friction Reactive COVER TYPE: Pearl Reactive FINISH Factory: Polish WEIGHTS 8-16: Pounds LANE CONDITION: Any REACTION: Straight WARRANTY: Two years from purchase date