Our aluminum alloy pressure cookers are produced according to the China National Standard (GB13623-2003), products with multiple safety features: 1) Material: aluminum 2) High intensity 3) Corrosion resistance 4) Steady and durable 5) Heat spreads evenly and rapidly without spot burning 6) With a small container (with holes) for steaming 7) Size: 18cm, 20cm, 22cm, 24cm, 26cm, 28cm 8) Capacity: 3L, 4L, 5L, 7L, 9L, 11L Packing: gift box, then in carton box