... .No bubbles 5.Smooth surface ModelPU Ring wheel with aluminum core BrandKamidMaterial Nature rubber, NBR, PU, Silicone... DimensionPer drawing or requestColormore than 30 ... MaterialAluminum, Steel, Sintered Bronze, Brass, Bearing, Many PlasticsBearing ChoicesBall, Needle, Sintered Bronze, PlasticMOQ10pcsPriceBased on dimension & qtyWarranty6 months ~ 12 months. PU Ring Wheel with aluminum ...