WMF Perfect Plus 8-1/2-Quart and 4-1/2-Quart Stainless Steel Pressure Cookers with Interchangeable Locking Lid 8-1/2 And 4-1/2-quart pressure cookers with interchangeable lid that fits both pots Heavy-gauge 18/10-stainless-steel construction with transtherm bases Black, phenolic, ergonomically designed handles stay cool to the touch Interchangeable lid provides advanced safety features and audible alarm Dishwasher-safe when lid handle removed; suitable for all cooktops, including induction