Stainless steel exterior and interior. Fully insulated, top mounted convection heating system with controlled humidity. Heavy-duty magnetic latch with "cool to touch" handle and turn-knob locking device. Solid state temperature controls - air temp adjustable from 70° to 215°F. Temperature controlled humidity system with four(4) gallon water reservoir and low water alarm. Heavy-duty, plate type casters, all swivel with 5" rubber wheels (front two with brakes).