Made from commercially pure, virgin aluminum. Mirror polished; interior and base matt finish. Inside fitting lid opens only when pressure falls. Stay cool handles. These are thermally efficient, mirror polished aluminum, with matt-finished base and interior. Pressure is regulated automatically to optimum levels for speed cooking. * Easy to Open & Close: quarter turn is enough * 5 liter capacity * New 'whistling' pressure regulator * Shielded Safety valve * Gasket lasts longer * Mirror polished; interior and base matt finish * Inside fitting lid opens only when pressure falls * Stay cool handles