Highest quality 18/10 stainless steel has kept its lustrous shine and will not rust, corrode, or chip Solid thermal aluminum sandwich base conducts heat superbly for even cooking of all foods whether you use gas, electric, ceramic or magnetic induction Spring-loaded stationary quiet safety valve has a visual indicator pin telling you how much pressure is inside the cooker Automatic lid-locking system prevents the lid from opening while the cooker is under pressure No fewer than five safety features engineered into each cooker make Duromatic the worldwide standard of safety Easy to use, works and looks like new Rubber seal for lid new, replaced recently, parts from Kuhn Rikon.