1) Aluminium body &cover,polished surface pressure cooker 2)Quick and heat transmission 3) Size:3L--20L 4)Multi-safety device ... , sealing well, easy to open and close the lid4) Multi-safety devices5) Quick and even heat transmission6) Pressure cooker, 3L,4L,5L,7L ... ,9L,11L,13L ,15L ,18L,20L for you to choose ...