This ball ships professionally PRE-DRILLED for your convenience. We?ve simplified the process so you can hit the lanes faster. Based on the ball weight you choose, we?ll drill it to a standard hand size that fits most bowlers in that weight range: X-Small (6lbs): Ages 8 under Small (8?9lbs): Ages 8?11, women?s ring size 8?11 Medium (10?12lbs): Ages 11?15, adult ring size 10 or under Large (13?14lbs): Men?s ring size 10?12 or larger hands X-Large (15?16lbs): Men?s ring size 13+ or extra-large hands Want a different drilling size than standard? Email us immediately after checkout with your order number and your preferred size. Hammer Effect Bowling Ball ? Power, Innovation, and Striking Style in Every Roll Step into a new era of bowling dominance with the Hammer Effect Bowling Ball?where cutting-edge technology, aggressive backend motion, and standout design meet. Engineered for high performance in medium to heavy oil conditions, the Hammer Effect is not just another pearl reactive ball?it?s a revolution. Featuring the advanced HK22 Cohesion Pearl coverstock and the dynamic Huntsman Core, this ball delivers fierce hook potential and explosive pin carry while maintaining exceptional control through the midlane. What makes the Hammer Effect different? It?s the first ball ever to combine a four-color visual design with groundbreaking traction-enhancing additives in the coverstock?giving you a ball that looks as powerful as it performs. Whether you're chasing your next personal best or dominating the competition, the Hammer Effect is built to help you get there. Why Bowlers Love the Hammer Effect: ? Revolutionary HK22 Cohesion Pearl Coverstock ? Grips the lane for maximum traction without sacrificing backend firepower ? Huntsman Core ? Asymmetrical core inspired by Hammer?s iconic designs, optimized for control and energy transfer ?? Aggressive Backend Reaction ? Delivers a powerful finish and impressive continuation through the pins ? First Ever Four-Color Design ? Black, blue, purple, and maroon hues make this ball a visual standout ? High Flare Potential (5?6") ? Offers sharp angles and hook motion ideal for medium-heavy oil lanes Technical Specs: Core Type: Asymmetrical ? Hammer Huntsman Core Coverstock: HK22 Cohesion Pearl Reactive Finish: 1500 Grit + Factory Compound RG (15lb): 2.47 Differential (15lb): .050 Mass Bias (15lb): .017 Flare Potential: 5 ? 6 Inches Lane Conditions: Medium to Heavy Oil Color: Black, Blue, Purple, Maroon (First 4-color ball) Weights: 12lb, 13lb, 14lb, 15lb, 16lb Performance Level: Upper Mid to High Performance Release Date: March 2024 Scent: N/A Dominate the Lanes with Confidence With the Hammer Effect, you get more than a ball?you get a weapon built for precision, power, and bold presence. Backed by Hammer?s legacy of innovation, this is the ball that will turn heads and crush pins from the first frame to the last.