... .No bubbles 5.Smooth surface DescriptionPU Roller wheels with aluminum coreBrandKamidMaterialNature rubber, NBR, PU, Silicone...DimensionPer drawing ... than 30 colors or per requestHardnessShore 5A~ 95ATemperatureup to 300°CHub MaterialAluminum, Steel, Sintered Bronze, Brass, ... machine to make sure the precision can match our customers' needs Long life PU roller wheels with aluminum core, ...