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. Hammer is always looking at adding balls to the line to fill gaps and make it the game's most versatile and complete line. Low flare cores have been a staple for Hammer, and currently, the Envy Tour balls are extremely popular, but we haven’t had a symmetric low flare in a while. We are excited to add the Scorpion Low Flare to the lineup. Removing the flip puck from the LED 3.0 core found inside the Scorpion Sting lowered the differential and flare potential, making this ball a perfect fit for Hammer. The Scorpion Low Flare will be a smooth and predictable ball motion, driven by the core numbers and the Semtex Hybrid cover, finished at 2000 Siaair. All styles will love the Scorpion Low Flare; higher rev rates will use it on anything, and lower rev rate players will find it useful on tricky conditions, and when the lanes are transitioning, either way, you won’t want to show up to bowling without one. PERFORMANCE: Mid COLOR: Purple / Black Pearl CORE: LED 3.0 Low Flare COVERSTOCK: Semtex Hybrid COVER TYPE: Hybrid Reactive FINISH: 500, 1000, 2000 Siaair Micro Pad WEIGHTS: 16-12 Pounds LANE CONDITION: Medium oil REACTION: Strong arc WARRANTY: Two years from purchase date Radius of Gyration (RG): 16lbs - 2.482; 15lbs - 2.474; 14lbs - 2.524 Differential (Diff): 16lbs - 0.028; 15lbs - 0.031; 14lbs - 0.031