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. As seen on… nope, wait a minute. You have probably seen this… nada, nope, wait just one minute. Truth is, YOU’VE NEVER SEEN A VERSION LIKE THIS! For all of you keeping score at home this marks the very first time in the domestic market we have released an IDOL series ball featuring our MicroTrax Pearl coverstock. Yes, you read that correctly. Never in the history of ever have we matched our nanoparticle pearl coverstock on this legendary core shape. Why you ask? That’s a good question. But that’s neither here nor there. The time was right, and that time is now! We felt following up the original solid with a pearl that provides the optimum traction footprint in oil while providing plenty of responsiveness down lane was exactly what the world needed. It’s ok, you can thank us later. Coverstock: MicroTrax Pearl Reactive Core: Ikon A.I. Core Technology Color: Bubblegum/Iris Finish: Reacta Gloss Condition: Medium -Medium Heavy Oil Flare Potential: High Available Weights: 12-16lbs RG: 16lbs (2.47) 15lbs (2.47) 14lbs (2.51) 13lbs (2.58) 12lbs (2.64) DIFF: 16LBS (.054) 15LBS (.056) 14LBS (.054) 13LBS (.047) 12LBS(.037)