Heavy duty 430 stainless steel exterior. Anodized aluminum finished bottom and back of exterior. High quality 304 series stainless steel top pan cover and interior, ABS evaporator drain cover. Insulated with 2.5" thick high density foamed-in-place CFC free polyurethane foam. Four 4" diameter casters (front casters with brakes). Door heater equipped door frames and 1/2" thick insulated top lid to prevent moisture build up.