1. not unglued 2. good wear resistance 3. no bubbles, smooth surface 4. high precision, can be within 2ddm DescriptionPU BearingBrandDuraproMaterialNature rubber, NBR, PU, Silicone...DimensionPer drawing or requestColormore than 30 colors or per requestHardnessShore 15A~ 95ATemperatureup to 80°CHub MaterialAluminum, Steel, Sintered Bronze, Brass, Bearing, Many PlasticsBearing ChoicesBall, Needle, ...