Rollerbones Turbo Quad Roller Derby Skate Wheels - Your Choice of Hardnesses/Durometers and your choice of Colors! - RollerBones Premium speed/derby wheel with an extruded aluminum hub. Superior roll and speed. Best wheel on the planet. These wheels are available in your choice of hardness - 85A, 88A, 92A, 97A, 101A. And 4 color options - Black, Green, White, and Yellow.