Polyurethane (PU) wheels offer the elasticity of rubber wheels combined with the toughness and durability of metal wheels. Amazon: 5 Caster Wheels Set of 8, Heavy Duty Casters with Brake, No... Description:* Polyurethane (PU) wheels offer the elasticity of rubber wheels combined with the toughness and durability of metal wheels. 80mm Swivel Castor, 130kg Capacity | Polyurethane Tyre Wheel, Roller Industrial Trolley Wheels 100mm Polyurethane Light Duty Castor - 100KG Rated Trolley Caster Wheels Red Thread Size: M10x30mm ; Wheel Material: Polyurethane(PU) MroMax 3Pcs 100mm Casters Wheels Dia 130Kg Polyurethane PU Wheels Castors M10 Thread Screw Iron Brake Locking Industrial for Trolley Wheel Dia: 100mm; Color: Red; Install Type: Threaded Stem Suitable for all floor types.