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. Storm Summit Ascent Bowling Ball ? Rise to the Top with Consistent Hooking Power Climb higher in performance with the Storm Summit Ascent, a bowling ball engineered to deliver forgiveness, predictability, and consistent power in every shot. Designed for medium to heavy oil conditions, this high-performance ball features advanced core and coverstock synergy for exceptional lane control and powerful backend motion. At the core lies the Centripetal HD A.I. Core, a symmetrical powerhouse enhanced with A.I. technology. This innovative design pushes the limits of low RG (2.46) and high differential (.056), enabling early revs and continuous motion that shapes smoothly through the pins. It?s built for those who need a reliable arc and want to maintain consistency frame after frame. Wrapped in the beloved R2S Solid Reactive coverstock and finished at 4000 Grit Abralon, the Summit Ascent provides a unique blend of early traction and smooth continuation. Unlike most solids, this ball delivers a cleaner read with a strong, arcing finish?ideal for bowlers who demand versatility with control. The Cream Soda scent is a fun twist on Storm?s signature fragrance feature, making your bowling experience both effective and enjoyable. Specs at a Glance: Coverstock: Storm R2S Solid Reactive Core: Storm Centripetal HD A.I. Core Core Shape: Symmetrical Core Coverstock Type: Reactive Surface Finish: 4000 Grit RG (15lb): 2.46 Diff (15lb): .056 Mass Bias Strength: N/A Flare Potential: 4?5 Inches Best For: Heavy Oil Weights: 12lb, 13lb, 14lb, 15lb, 16lb Color: Grey, Turquoise Performance Level: High Performance Bowling Balls, Storm Premier Line Scent: Cream Soda Brand: Storm From your league night to tournament play, the Summit Ascent is built to help you climb the leaderboard with consistent hook potential and dependable motion.