Features: natural rubber material, double bearing, quiet and environmental protection, thick flat plate, 360 degree free rotation, free start and stop, strong load, easy to install, strong wear Free combination of casters, can be freely matched according to your needs A: directional wheel x4 B: universal wheel x4 C: 2x directional wheel + 2x universal wheel Product Name: Casters Colour: Black Specifications: 4 inches, 5 inches Type: directional wheel, universal wheel Material: rubber 4-inch single wheel load: 100KG 5-inch single wheel load: 110KG Suitable for: warehouses, shelves, trolleys, flatbeds, scaffolding, logistics and transportation, factory terminals, etc. note: Package contents: casters x4, free matching screws The size of this product is manual measurement, there may be a slight error, please prevail in kind. The products are taken in kind, due to lighting / light and other reasons may have a little color difference, please refer to the actual product. We are 1-2 days delivery, 15-25 days to arrive, if you have any questions, please contact us, we strive to make you satisfied.