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. Radical Evil Eye Black Bowling Ball ? Heavy-Oil Hook With Precision Power The Radical Evil Eye is engineered for bowlers who need early traction, strong mid-lane read, and powerful continuation through heavy oil. This blacked-out powerhouse features the HK22C+ solid reactive coverstock, giving it exceptional bite in high-volume conditions. Its unique core design offers both symmetrical and asymmetrical motion depending on the drilling layout, giving bowlers unmatched versatility and the widest intermediate differential range in its class. Built to deliver a strong, predictable motion with a relentless backend finish, the Evil Eye thrives on challenging lane conditions where control and power matter most. The aggressive 500/1500 Siaair finish provides maximum surface grip, making it ideal for heavy-oil environments and competitive bowlers needing a ball that reads early and finishes strong. Key Features Blacked-out performance ball designed for heavy oil. HK22C+ solid reactive coverstock for maximum traction. Shape-shifting core: symmetrical by default; becomes asymmetrical when drilled accordingly. Strong mid-lane read with relentless backend continuation. 500/1500 Siaair Micro Pad finish for aggressive lane grip. Ideal for high-performance and top-shelf Radical line users. Specifications Brand: Radical Core Name: Radical Evil Eye Symmetric Core Core Shape: Symmetrical Coverstock Type: Reactive Coverstock Name: Radical HK22C+ Reactive Radius of Gyration (RG, 15LB): 2.49 Differential (Diff, 15LB): 0.046 Mass Bias Strength: N/A Flare Potential: 4?5 Inches Surface Finish: 1500 Grit (500/1500 Siaair Micro Pad) Lane Conditions: Heavy Oil Ball Weights Available: 12LB, 13LB, 14LB, 15LB, 16LB Performance Level: High Performance Bowling Balls / Radical Top Shelf Color: Black