1) Aluminium body &cover,polished surface pressure cooker 2)Quick and even heat transmission 3)Multi-safety ... ,polished body surface.2) Polished surface and shining looking3) The silicon sealing ring, without poison or odor, sealing well, easy to ... ) Multi-safety devices5) Quick and even heat transmission6) Pressure cooker, 2L,3L,4L,5L,6L,8L,10L,12L for you to choose.