One (1) stainless steel (for corrosion resistance),heating element for uniform generation of electric heat. Cabinet comes with a total of 3000 watts. 5" (127 mm) diameter plate castors – locks provided on front set. Three (3) Heavy duty, chrome plated, wire shelves per section. Entire cabinet structure and solid door are foamed-in-place using a high density, polyurethane insulation that has zero ozone depletion potential (ODP) and zero global warming potential (GWP).