Wonderchef Nigella Presure Cooker is the finest cooker available in 304 Stainless Steel. The material and build quality is top-grade. Its body is given the perfect curvature which makes it easy to stir the food prior to Presure cooking. Heavy 3-ply bottom transmits heat quickly and evenly which saves fuel and prevents the food from burning or sticking to the cooker body. The stainless steel that comes in direct contact with your food is completely non-reactive and non-toxicHighly durable bodyNigella Stainless Steel Presure Cookers body and lid are made from food-grade 18/8 non-magnetic superior stainless steel (AISI Grade 304). 304 Stainless Steel has greater anti-corrosion resistance and to better withstand the various acids found in many foods such as fruits meats milk and vegetables. It is hence one of the best quality stainless steel grades used for making cooking utensils.Energy efficient Sandwich BottomThe bottom of Nigella Presure Cooker is its specialty. Sandwiched between two sheets of stainless steel is a thick core of aluminum. Aluminum is 9 times better conductor of heat than steel. This ensures heat spreads quickly and evenly thus avoiding hotspots and burning or sticking of food. Ergonomic Soft-touch Handle Nigella Presure Cooker comes with soft-touch stay-cool handles which are easy and comfortable to hold while cooking. The metal screw and rivets used to fasten the handles are safely recessed to eliminate the chances of your hand coming into contact with the hot metal while cooking.Food Grade gassketThe gassket is made of specially formulated food grade rubber with longer life. It does not bulge and steam does not escape from the lid.