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. Defender Hybrid was the first Brunswick ball featuring the groundbreaking new coverstock base, HK22. The motion was more hook in oil and more backend for a shiny ball than had ever been seen in the Brunswick line. HK22 balls have evolved significantly over the last year and a half. We’re excited to continue the evolution of the innovative cover base with the Ultimate Defender. This ball produces exceptional hook in the oil and impressive continuation on the backend because of the clean and strong nature of the cover despite the dull surface. The Ultimate Defender will be your ultimate choice when combating oily conditions. Compared to the Mindset, the Ultimate Defender will be cleaner and sharper while still handling the oil conditions. Performance: Pro / Traction / 89 Color: Violet/ Pink/ Navy Core: Portal X Coverstock: HK22 - A.C.T 3.0 HYBRID& Cover Type: Hybrid Reactive Finish: 500, 2000 Siaair Micro Pad Weights: 12 - 16lbs Warranty: Two years from purchase date RG: 16lbs(2.489) 15lbs(2.473) 14lbs(2.493) 13lbs(2.597) 12lbs(2.593) Diff: 16lbs(0.046) 15lbs(0.054) 14lbs(0.054) 13lbs(0.041) 12lbs(0.041) ASY: 16lbs(0.013) 15lbs(0.015) 14lbs(0.015) 13lbs(0.014) 12lbs(0.014)