1.good wear resistance 2.Good elasticity 3.High precision, high concentricity 4.No bubbles 5.Smooth surface DescriptionPU ... wheelBrandKamidMaterialNature rubber, NBR, PU, Silicone...DimensionPer drawing or requestColormore than 30 ... our customers' needs Soft wear resistant PU wheel with axle shaft, High quality (Many hardness)