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. Trouble Maker was a revolutionary ball featuring the first core designed specifically for no-thumb bowlers. The ball performed incredibly for all styles, even bowlers who use a thumb hole, but no-thumb bowlers saw more versatility from this ball than any other. DV8 Pro, Matt Ogle, had nine (yes, you read that right, nine) original Trouble Makers in his arsenal and has been requesting a cleaner and more angular version. The Trouble Maker Pearl is the perfect follow-up. By adding HK22 with Inciter Pearl additives, this core and cover combination will be just what every no-thumb bowler needs to combat medium oil. COLOR: Black / Blue / Gold CORE: Dualistic COVERSTOCK: HK22 - Inciter Xtreme COVER: TYPE Pearl Reactive FINISH: 500, 1000, 1500 Siaair / Factory Compound WEIGHTS: 16-12 lbs. HOOK: 310 LENGTH: 140 PERFORMANCE: Length with strong backend LANE :CONDITION Medium oil RG - 16lbs (2.514) 15lbs (2.496) 14lbs (2.52) 13lbs (2.577) 12lbs ( 2.599) Diff - 16lbs (.037) 15lbs (.045) 14lbs (.043) 13lbs (.043) 12lbs (.043)