One (1) stainless steel (for corrosion resistance), heating element per section for uniform generation of electric heat. The 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. The 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).