What We Like About This Rubbermaid 3 Shelf Xtra CartDesigned to work in both front and back of the house applications the Rubbermaid 3 Shelf Xtra Cart is ideal for heavy loads up to 300 pounds. It features aluminum uprights and molded polyethylene sh elves for durability. Complete with non-marking 4-inch swivel casters for easy portability. Crafted by the trusted Rubbermaid brand to ensure quality use in your office or school for years