STURDY STRUCTURAL FOAM CONSTRUCTION WON'T RUST DENT CHIP OR PEEL. ROUNDED CORNERS PROTECT WALLS AND FURNITURE. LIGHTWEIGHT AND MANEUVERABLE. LARGE 4"" (10.2 CM) NON-MARKING SWIVEL CASTERS. STURDY STRUCTURAL FOAM CONSTRUCTION WON'T RUST DENT CHIP OR PEEL. LARGE NON-MARKING CASTERS. ERGONOMICALLY DESIGNED PUSH HANDLE PROVIDES OPTIMUM HAND PLACEMENT AND PUSH HEIGHT IMPROVING CONTROL AND WORKER SAFETY MOLDED-IN STORAGE COMPARTMENTS HOLSTERS HOOKS AND NOTCHES MOLDED-IN CUSTOMIZABLE FITTINGS HIGH DENSITY STRUCTURAL RESIN CONSTRUCTION EASY-ACCESS BOTTOM SHELF BEST-IN-CLASS CASTERS TO MEET THE MOST DEMANDING ENVIRONMENTS