Modular stacking trays that stack up to 5 feet high to form a complete flat filing system. They?re constructed of high density polyethylene with steel reinforcement for rigid support and strength. Easy to clean. Trays have a 40 lb. load capacity and are ideal for storing matte board, vellum, acetate, drawings, blueprints and other flat materials. White color, sold two per carton. Optional light oak finish wood core vinyl laminate tops available.