Rack adjusts to hold up to fifty 48 in. mats, thirty-two 72 in. mats or a combination of both. 1.5 in. and 1.25 in. square steel tubing delivers a solid storage structure. Four non-marring polyurethane casters move smoothly for simple transport of the rack. Two swivel casters lock to prevent the rack from moving when loading or unloading mats. Warranty: One year. Silver powdercoat finish resists wear and adds sleek, shiny style to the gym or fitness area.