Material: Swivel casters are soft rubber wheels and TPE materials, super quiet, won't disturb anyone while working, high elasticity, 360 flexible use. Design of the Bearings: Ball bearing, integrated bearing, steel ball steering design, sealed bearing has low friction resistance, flexible bearing, can rotate 360 degrees, stable, high temperature resistance, high speed, dustproof and non-stick, and can be used for a long time Built-in silent bearing, very quiet and durable. It is the ideal choice for any DIY furniture with movable casters. Suitable for a variety of floors: Made of soft rubber, which is soft and will not damage the floor . Rubber casters have elasticity, toughness and durability. Suitable for all types of floors, such as ceramic tiles, cement floors, marble, carpets, parquet floors, etc. Features: There is no brake, 360 degree rotation can be completely free to move, and the applicability is stronger.The wheels are made of soft rubber and of rust-proof TPE material to improve strength and durability.Suitable for different floors.Built-in low-noise bearings, quiet movement.Material: Rubber soft and TPEColour: blackWheel diameter: 40 mmM8 x 15 mm threadLoad capacity 20 kg per castor. Package Content 4 x 40 mm swivel castors, with M8 x 15 mm threaded rod