... 2.Good elasticity 3.High precision, high concentricity 4.No bubbles 5.Smooth surface DescriptionPU wheelBrandKamidMaterialNature rubber, NBR, PU, Silicone ... PlasticWarranty6 months ~ 12 monthsSpecial Feature:1. good wear resistance2. high precision, can be within 2ddm3. good depth of parallelism4. ... our customers' needs Soft wear resistant PU wheel with axle shaft, High quality (Many hardness)