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 Storm Ice Storm Blue/White will freeze your opponents in place whenever you pull this out of the bag. A 3-Piece Pancake Core is surrounded by a Pearlized Polyester Coverstock that will allow the ball travel down the lane, pinpointing wherever you direct it. Finishing this ball in a 3500 grit polish, Storm wants this ball to have maximal length while retaining the accuracy a Polyester ball should have. Whether you bowl for cash or just for fun, the straight-shooting, durable Ice Storm is so cool your biggest rival will have a meltdown! Color: Blue/White Core: Traditional 3-piece Core Coverstock: Pearl Polyester Finish: 3500-grit Polished Recommended Lane Condition: Any