Buffalo QCP420 21-Quart Stainless Steel Pressure Cooker [Classic series] Exclusively made from BUFFALO Clad, its thermal conductivity is faster and more even than conventional stainless steel cookware German gear with mortise and tenon joint design, simple switch, safe, durable and easy cleaning Pressure indication valve, relieve pressure easily/ Emergency pressure relief safety device Buffalo Pressure Cooker also manage to obtain ISO 9001 : 2000 and Safety Goods (SG) Certificate from Japan. Suitable for use on gas stove, electric stove, induction cooker and ceramics furnace.