... 5.Smooth surface DescriptionPU BearingBrandDuraproMaterialNature rubber, NBR, PU, Silicone...DimensionPer drawing or requestColormore than 30 colors ... to 80°CHub MaterialAluminum, Steel, Sintered Bronze, Brass, Bearing, Many PlasticsBearing ChoicesBall, Needle, Sintered Bronze, PlasticWarranty6 months ... can match our customers' needs 625zz PU Bearing, flat surface or shelled surface (many color)