"4-WAY ENTRY, NESTABLE, FIRE RETARDANT, REUSABLE; TWIN SHEET THERMOFORMING METHOD WITH STEEL INSERT TO PROVIDE FOR ADDED STRENGTH, RIGIDITY AND RACK ABILITY; HOLLOW CELLS PROVIDE FOR LIGHTER WEIGHT AND/OR FOR REINFORCEMENT; CAPACITY 3,000 LBS. DYNAMIC LOAD; O/A DIM. 48 IN. LG. X 40 IN. W. X 6 IN. H.; MATERIAL THERMOFORMED HIGH DENSITY POLYETHYLENE; COLOR MATTE BLACK"