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 Absolute Power falls in line with what Storm Bowling is known for best: backend reaction. The Absolute Power is the newest addition to the Premier Line in the lineup. It features the Sentinel core surrounded by the beloved R2S Deep Solid Coverstock.This solid version of the Absolute, will give more midlane read while maintaining its confident back-end reaction when compared to the original. Coverstock: R2S DEEP Solid Reactive Weight Block: Sentinel Core Factory Finish: 4000 Grit Ball Color: Berry/Tangelo/Steel Flare Potential: High Fragrance: Blueberry Orange Cake Weights: 12-16lbs RG - (16lbs) 2.48 (15lbs) 2.48 (14lbs) 2.54 (13lbs) 2.57 (12lbs) 2.59 Diff - (16lbs) .048 (15lbs) .050 (14lbs) .045 (13lbs) .032 (12lbs) .029 Int Diff - (16lbs) .020 (15lbs) .021 (14lbs) .018 (13lbs) .010 (12lbs) .008