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. For decades, Columbia 300 has been revered as a leader in providing outstanding Entry Level options, and it was one of our goals to preserve this reputation by introducing familiar products in this category. The Beast was a great addition to the Columbia 300 line last season, and weΓÇÖre bringing it back. There are four Beasts total to cover a wide range of color options including two new hybrid options for added performance. The colors are Purple Sparkle, Blue Pearl, Blue/Red/Black, and Black/Pink/Purple. Weights: 10-16 pounds Color: Blue Pearl Coverstock: Bend-It Pearl Cover Type: Pearl Reactive Core: Beast RG 15#: 2.540 Diff 15#: 0.033 Finish: 500 Siaair, Crown Factory Compound, Crown Factory Polish