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. The Black Widow, Hammer's most successful line, is back at it, this time with a polished pearl that will get a ton of attention. Pink was incredible for the Widow series and the Ghost; a gorgeous white pearl version will be the next big thing. The overwhelming response by Hammer fans for the Black Widow 2.0 and its longevity gives us a lot of confidence that this polished, pearl version will make its way into every Hammerhead's bag. PERFORMANCE: Upper Mid COLOR: White CORE: Gas Mask COVERSTOCK: Aggression Pearl COVER TYPE: Pearl Reactive FINISH: 500, 1000, 1500 Siaair / Crown Factory Compound WEIGHTS: 16-12 Pounds LANE CONDITION: Medium to heavy oil REACTION: Aggressive midlane and backend WARRANTY: Two years from purchase date