Matter Bourgeat excellence cookware design that combines cooking performance with ergonomics. Suitable for all heat sources.cooking:optimized Cooking by uniform heat conduction in skirt and base. May be used on any available heat source.hygiene:handles Are perfectly watertight (no risk of bacteria development)the angle at the base and area around the handle are designed for easy cleaning. Top features: special stainless steel body. Sandwich aluminum base bottom with shape memory. Reinforced edge. Handles are insulated stainless steel tube and &No.34;staycool&No.34; to prevent heat diffusing. French standard NF and us NSF.