This Camshelving mobile unit includes (4) 5" diameter swivel casters (2 locking) for easy maneuvering. The composite material is 60% lighter in weight that steel yet just as strong. The Camshelving mobile unit has a lifetime warranty against rust and corrosion. The shelf plates contain Camguard® antimicrobial protection that is permanently embedded and are dishwasher safe. The Camshelving mobile unit is versatile for any environment.