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. Brunswick’s ethos is to advance the sport by focusing on better products, leading to higher scores and happier bowlers. The new Brunswick Ethos ball epitomizes what Brunswick stands for. The Ethos is an eye-catching tri-mix of colors, poured with the industry-leading HK22 base cover with Savvy Hook 4.0 Pearl additives and a dual-density symmetric core. Ethos is shiny; it retains energy for the backend and creates a sweeping and aggressive motion that demonstrates our passion for bringing innovative products to bowlers. Performance: High / Flip / 82 Color: Purple / Sky / Carbon Core: Ethos Coverstock: HK22 - SH 4.0 Pearl Cover Type: Pearl Reactive Finish: 500, 1000, 1500 Siaair / Crown Factory Compound Weights: 16-12 lbs. Warranty: Two years from purchase date RG (16 lbs)2.495 (15 lbs)2.481 (14 lbs)2.505 (13 lbs)2.510 (12 lbs)2.577 DIFF (16 lbs)0.046 (15 lbs)0.053 (14 lbs)0.053 (13 lbs)0.047 (12 lbs)0.045