The body and lid are made from superior grade non-magnetic stainless steel. The cooker has an external base on grade magnetic stainless steel which makes it induction compatible. The base always stays flat and never bulges. It stays bright, does not pit or corrode, is extremely hygienic and stays looking new for years. Suitable for use on all domestic gas, electric, halogen, ceramic and induction cooktops. The latest improvement is a superior pressure regulating system that controls pressure to a narrower, more efficient range, reduces sprouting of frothy foods (such as dal) and is easier to insert and remove. The safety valve is located under the lid handle bar so that when it operates the steam is safely deflected downwards. The gasket has minimum exposure to steam inside the cooker, does not rub every time the product is opened and closed - so lasts longer.