Rollerbones Team Logo WheelsTeam Wheel – High Rebound Indoor Wheel great for recreational and Artistic Skating.• Wheel Diameter: 57 MM & 62 MM• Wheel Hardness: 98 A & 101 A• Wheel Formula: SBA• Wheel Suggested Use: Recreation & Artistic Skating• Wheel Surface Smooth• Pack of 8 WheelsRollerbonesManufacturing the best Roller Derby and Roller Skate Wheels for decades.Rollerbones was established in 1979 when a white MDI formula used by Powell Corp for skateboard wheels replaced a transparent TDI formula, the roller-skate industry standard.This change led to a shift in the industry as other companies followed.