The Piper RT-85 casters feature a durable polyurethane construction, ensuring smooth mobility and resistance to wear. With a diameter of 3.15 inches and a height of 5.9 inches, these casters provide stability and support for various applications. This set includes four casters, making it ideal for enhancing the functionality of furniture, carts, or equipment. Enjoy effortless movement and reliable performance with the Piper RT-85.