Wheel material: Polyurethane (PU) tread + plastic wheel core, PU Small Bottom Plate Movable Casters with wear resistance, chemical resistance, high strength, high elasticity, low pressure resistance, shock absorption, tear resistance, radiation resistance, high load bearing and good performance such as shock absorption buffer.Caster Wheel Stops applicable to the medical industry, electrical equipment industry, trolley industry, furniture industry, toolbox, etc. Caster Wheel Types:Caster Wheel Chocks Tread hardness: 90 (±5) Shore A Temperature range: -40~80°C" Wheel diameter: 3"-5" Load capacity: 70-135kg Flat bottom fixed casters, pressed rigid wheel frame, Caster Wheel Bearings. Wheel Material: PU caster with PP core Bearing: ball bearing Housing: Housing made of pressed steel, zinc plating, fixed caster.