The set contains 4 transport castors with brakes. Each roller is 25mm in diameter with an L-shaped right-angle mounting plate and screws. Our castors are made of high-quality TPE material with good abrasion resistance. The wheel core is made of polypropylene, which is highly thermoplastic and corrosion resistant. The outer wheel is made of synthetic rubber, which is wear-resistant and has with good anti-slip effect. These casters operate quietly and smoothly without scratching the floor. They can support up to 40 kg and are suitable for coffee tables, children's beds, wardrobes and other furniture.