Polymer shelves of Lifestor MasterTrak attach to posts of epoxy-plated mild steel or 16 ga Type 304 SS, eliminating corrosion and inhibiting bacteria growth. Intermediate shelf towers travel on 5 in. urethane casters guided by overhead track 6-21 ft long. Stationary shelves at either end support overhead track. Various sizes are available, as are dividers, ledges, enclosure panels, and other accessories.