1.good wear resistance 2.Good elasticity 3.High precision, high concentricity 4.No bubbles 5.Smooth surface DescriptionPU Roller wheels with aluminum coreBrandKamidMaterialNature rubber ... 5A~ 95ATemperatureup to 300°CHub MaterialAluminum, Steel, Sintered Bronze, Brass, Bearing, Many PlasticsBearing ChoicesBall, Needle, Sintered Bronze, PlasticWarranty6 months ~ 12 monthsSpecial ...