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. Improving an already incredible line isn’t easy, but we managed to do it again with the new Black Widow 3.0. Each Widow release in recent years has been more popular than the previous and has taken ball reaction to new levels, and the Black Widow 3.0 will not be an exception. The Black Widow 3.0 is an incredible complement to the Widow 2.0 Hybrid; it has surface and tractions more in oil, making it a great ball to pull out of your bag first. The new Black Widow 3.0 is a solid reactive, much like the Black Widow 2.0, but the cover has been upgraded with a solid version of HK22 and has the same out-of-the-box surface as the Black Widow 2.0. HK22 gives the new Black Widow an advantage on medium to oily lanes, and Hammer fans will be excited when they see that it’s the traditional black and orange Hammer colors. PERFORMANCE: Upper Mid COLOR: Black / Orange CORE: Gas Mask COVERSTOCK: HK22 - Aggression Solid COVER TYPE: Solid Reactive FINISH: 500, 1000, 2000 Siaair Micro Pad WEIGHTS: 16-12 Pounds LANE CONDITION: Medium to heavy oil REACTION: Aggressive backend WARRANTY: Two years from purchase date RG - 16LBS(2.510) 15LBS(2.500) 14LBS(2.500) 13LBS(2.589) 12LBS(2.612) DIFF - 16LBS(0.048) 15LBS(0.058) 14LBS(0.056) 13LBS(0.043) 12LBS(0.043) ASY 16LBS(0.015) 15LBS(0.016) 14LBS(0.016) 13(0.011) 12LBS(0.011)