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. Since their conception back in 2016, the Hustle Series of bowling balls has provided outstanding performance above and beyond the retail price. From the 34th sanctioned 900 Series by the Hustle™ INK, to countless TV appearances over the years on both the PBA & PWBA Tours. The various versions of the Hustle's have provided consistent reactions time and time again. And while the inner Hustle Core has remained the same since day one, it's the different variations of the VTC™ (Versatile Traction Control) Coverstock - Solid, Pearl & Hybrid, that have kept this line viable on those Light to Medium Oil conditions for every level of bowler from the first-timers, all the way up to the pros. COLOR: Slate/Black CORE: Hustle™ Core COVER: VTC™ Solid Reactive BOX FINISH: 4000-Grit Abralon BUILT FOR: Light to Medium Oil FLARE POTENTIAL: Low - Medium AVAILABLE WEIGHTS: 16 – 10 lbs. RG: 16lbs(2.53) 15lbs(2.53) 14lbs(2.55) 13lbs(2.63) 12lbs(2.73) 11lbs(2.73) 10lbs(2.77) Diff: 16lbs(.030) 15lbs(.030) 14lbs(.030) 13lbs(.009) 12lbs(.011) 11lbs(.012) 10lbs(.015)