Material: Swivel casters feature soft rubber wheels and TPE materials, providing quiet operation. High elasticity and 360-degree flexibility ensure smooth mobility. Bearing Design: Equipped with ball bearings, integrated steel ball steering, and sealed bearing construction for low friction resistance, enabling smooth 360-degree rotation. Bearings offer stability, high temperature resistance, high-speed performance, dustproof protection, and non-stick functionality for long-lasting use. Built-in silent bearing ensures quiet and durable performance. Ideal for DIY furniture requiring movable casters. Floor Compatibility: Made with soft rubber material that is gentle on floors and prevents damage. Rubber casters offer elasticity, toughness, and durability. Suitable for various floor types including ceramic tiles, cement floors, marble, carpets, and parquet floors. Features: Non-brake design allows complete 360-degree rotation for unrestricted movement and enhanced versatility. Wheels constructed from soft rubber and rust-proof TPE material to increase strength and durability. Designed for use on multiple floor surfaces. Built-in low-noise bearings enable quiet movement. Specifications: Material: Rubber and TPE. Color: Black. Wheel Diameter: 40 mm. Thread Size: M8 x 15 mm. Load Capacity: 20 kg per castor. Package Content: 4 x 40 mm swivel casters with M8 x 15 mm threaded stem.