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. Brunswick Ivory Rhino Pro ? Advanced Power Meets Precision Control Step up your game with the Brunswick Ivory Rhino Pro Bowling Ball, engineered for advanced performance and versatility on medium to heavy oil lane conditions. Featuring the HK22 Activator Plus 3.0 Pearl Reactive coverstock, this ball delivers sharp down-lane motion and impressive backend recovery without sacrificing control. At its core lies the legendary Vintage Light Bulb Low RG Core, designed to provide a consistent roll with a smooth transition from skid to hook. The symmetrical core paired with a 2.56 RG and .032 differential ensures reliable flare and optimal ball motion for a wide range of bowling styles. Finished with a 1500-grit polish, the Ivory Rhino Pro is the perfect choice for bowlers who want maximum flip and responsive backend reaction. Whether you're a seasoned competitor or an evolving player seeking a high-performance edge, this ball delivers. Key Features: Coverstock: Brunswick HK22 Activator Plus 3.0 Pearl Reactive Core: Brunswick Vintage Light Bulb Low RG Core Core Shape: Symmetrical Finish: 1500 Grit Polish RG (15lb): 2.56 Diff (15lb): .032 Flare Potential: 3?4 Inches Lane Conditions: Medium ? Heavy Oil Color: White Scent: None Performance Level: High Performance Bowling Balls Weight Options: 12LB, 13LB, 14LB, 15LB, 16LB Warranty: 2 Years from Date of Purchase Built for bowlers who want high-end motion with clean skid and powerful backend flip, the Ivory Rhino Pro is your next go-to weapon on the lanes.