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. Track Criterion Hybrid Bowling Ball Power, precision, and next-generation motion?meet the Track Criterion Hybrid Bowling Ball, the latest high-performance release that honors Track?s legacy while rewriting what bowlers expect from modern asymmetrical design. At its core is the new Criterion M.D. Core, engineered for versatility and aggressive motion. It pairs perfectly with the all-new Super Response Hybrid Coverstock, enhanced with HK22C technology, delivering earlier read in the mid-lane with an explosive backend finish?ideal for medium to heavy oil conditions. This combination makes the Criterion Hybrid a standout option for competitive bowlers seeking stronger continuation without sacrificing control. Finished at 1500 Grit Polish, this ball reads early and retains power through the pins. The RG of 2.50, Diff of .052, and Mass Bias Strength of .018 give it a dynamic flare potential of 4?5 inches, producing a sharp, angular finish that dominates in demanding oil volumes. Technical Specifications: Brand: Track Coverstock Type: Hybrid Reactive Coverstock Name: Super Response Hybrid with HK22C Core Shape: Asymmetrical Core Core Name: Criterion M.D. Core RG (15LB): 2.50 Differential (15LB): .052 Mass Bias Strength: .018 Flare Potential: 4 ? 5 Inches Surface Finish: 1500 Grit Polish Lane Conditions: Medium ? Heavy Oil Performance Level: High Performance Color: Blue, Gold Available Weights: 12LB ? 16LB Scent: None For bowlers chasing bold backend motion and superior lane control, the Track Criterion Hybrid is not just a new chapter?it?s a breakthrough.