Bore: 0.500 in. [12.7 mm] (1/2) Hex, 3/8 in. Hex, 5mm Hex, Nub
Color: Green, Black, Blue, Orange
Core Material: Polycarbonate
Diameter: 2 in., 2.25 in., 3 in., 4 in.
Durometer: 35A (Green), 40A (Orange), 50A (Blue), 60A (Black)
Maximum RPM: 3500 - 9000 RPM
Tread Material: TPU
Weight: 2 in. = 0.035 lbs., 2.25 in. = 0.08 lbs., 3 in. = 0.12 lbs., 4 in. = 0.228 - 0.269 lbs.
Width: 2 in. = 0.5 in., All others = 1 in.