Material: Steel and Zinc construction 3.5" Grey Wheel Caster with Brake Mechanism 360-degree Swivel Design for Complete Rotation Soft Rubber Wheel for Smooth Movement Maximum Load Capacity of 250lbs Introducing the Penn Elcom 6355SRTB Grey Wheel Caster: a robust and versatile solution. With a 3.5'' size and equipped with a reliable nylon bearing swivel, this caster ensures effortless mobility. The soft rubber wheel guarantees smooth and quiet operation. Additionally, this caster offers a substantial load capacity of 250lbs, providing stability and reliability. With the added benefit of a built-in brake mechanism, you have full control over the caster's movement.