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. Meet the Storm Level?Storm?s most futuristic release yet, blending brand-new materials and core innovation for a reliably sharp and consistent motion. If you demand fresh technology and dependable performance, the Level delivers both. The all-new RPM (Regenerative Polymer Matrix) Solid Reactive coverstock is a Storm exclusive?created to maintain its surface integrity while absorbing lane oil faster than traditional materials. The result? A strong, reliable ball motion that holds true from game to game. Inside, Storm's Equalizer A.I. Core gives the Level its name. Engineered with a tall, low-density block and symmetrical shape, this high-tech core creates a smooth, readable motion with balanced hook potential. An RG of 2.59 and differential of 0.027 (15lb) make this ball ideal for medium oil conditions where precision is everything. Finished at 1000 Grit, this ball digs in early while retaining energy for a continuous and predictable backend. Add in the sleek black color and signature Grapple scent, and you?ve got a ball that looks as sharp as it rolls. Specs at a Glance: Coverstock: Storm RPM Solid Reactive Core: Storm Equalizer A.I. Core Core Shape: Symmetrical Core RG (15lb): 2.59 Diff (15lb): 0.027 Mass Bias Strength: N/A Finish: 1000 Grit Flare Potential: 3?4 Inches Best For: Medium oil conditions Color: Black Weights: 12lb, 13lb, 14lb, 15lb, 16lb Coverstock Type: Reactive Performance Level: High Performance Bowling Balls Scent: Grapple Brand: Storm Whether you?re chasing precision, innovation, or just want to try something next-gen, the Storm Level is the answer to what?s next in bowling.