Wheel size: Outer diameter is 2.75 in (70mm), width is 0.9 in (23mm), Center Bearing internal diameter is 6mm (see the wheel size label in the picture).
Use rubber material to Integrally molded, mute, wear, Matched double bearings, flexible rotation, can also withstand a lot of weight.
Package comes with 1.37 in (35mm) and 1.57 in (40mm) axles bolt and washers to meet different needs of 35mm and 40mm.