Wheel material: Polyurethane (PU) tread + plastic wheel core, PU Movable Double Brake 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. Applicable to the Middle Heavy Duty Casters for medical industry, electrical equipment industry, Trolley casters industry, Heavy Duty Chair Casters for furniture industry, toolbox, Rubber Wheels For Office Chairs, PU Caster etc. Caster Wheel Installation Tread hardness: 90 (±5) Shore A Temperature range: -40~80°C" Wheel diameter: 3"-5" Load capacity: 70-135kg Flat-bottomed double brake casters, pressed rigid wheel frame, ball bearings. Housing: Housing made of pressed steel, zinc plating, fixed caster with total brake. FAQ…