1) Aluminium body &cover,polished surface pressure cooker 2)Quick and heat transmission 3) Size:3L--20L 4)Multi- ... :1) Aluminum alloy stronger body and cover,polished body surface.2) Polished surface and shining looking3) The silicon sealing ring, without ... the lid4) Multi-safety devices5) Quick and even heat transmission6) Pressure cooker, 3L,4L,5L,7L,9L,11L,13L ,15L ,18L,20L ...