Coverstock: Urethane Solid Ball Color: Dark Blue/Light Blue All colors do vary somewhat from the picture shown. Ball Finish: 400-High Gloss Polish Hook Potential: 55 (Low) on a scale of 10-175 Low-High Length: 170 (Late) on a scale of 25-235 Early-Late RG Differential: 0.019 inches RG Average: 2.703 (High) on a scale of 2.43-2.80 Very Low-High Break Point Breakpoint Shape: 55 (Arced-Angular) on a scale of 10-100 Arced-Angular Recommended Lane Conditions: Dry to Medium Description: Urethane is the next step up from plastic. Urethane coverstocks improve durability and increase hooking action in the oil. Large differences in hook potential can be created by sanding or shining urethane coverstocks. Groove urethane is the most affordable urethane in the line.