Swivel Casters Material: Metal+Rubber Packaging: Includes 8 casters Load capacity: Each rubber caster can bear a weight of 10kg/22lb; Roll steadily and quietly Caster Wheels Usage: Used for small machinery, hand carts, furniture, chairs, flower pot racks, shelves, etc. It can be safely placed on carpets, concrete, tiles, wood surfaces, etc 360 degree pivot action: can rotate smoothly on hard and smooth surfaces (such as concrete and ceramic tiles) with low resistance Material: Metal+Rubber