[Crowned Polyurethane Tread]: The thickened polyurethane tread offers superior durability, providing excellent resistance against wear, chemicals, oils, and debris. It ensures a smooth, mark-free roll, making it perfect for a variety of flooring surfaces while protecting them from damage. [Aluminum Core Wheel]: Each wheel features a lightweight aluminum core that resists rust and reduces overall weight, making the casters both sturdy and easy to maneuver. The aluminum also aids in maintaining balance under heavy loads, contributing to the long lifespan of the caster. [Heavy Duty Load Capacity]: Designed with strength and sturdiness in mind, these casters have a long lifespan and can handle heavy equipment and loads with ease. Each caster holds up to a maximum of 1400 lbs. or 5600 lbs when purchasing a set of 4 casters. [Ergonomic Casters]: These bright orange wheels stand out, crowned tread with precision bearings make a very ergonomic and quiet ride putting less stress on the user and equipment.This wheel is the perfect choice for applications where superior ergonomic performance is critical. [Industrial Grade Applications]: These heavy duty aluminum casters are perfect for a variety of industrial uses. This caster is widely recognized in manufacturing plants and automotive factories. It is also widely used in workbenches, trailers, workshops, tool boxes, pallet racks, AGV cart handling, manufacturing stands, rolling box storage, heavy machine shops. 6"X2" Heavy Duty Industrial Casters, Crowned Polyurethane Tread Aluminum Core, Rust and Wear Resistant, Precision Ball Bearings- Set of 4 with 5600lbs Capacity (4 Swivel)