The pressure builds up without issue, but please be aware that some spillage may occur during heating. There is no inner pot or instruction manual; everything included is shown in the photos. [Product Description] ・Aluminum pressure cooker ・High-temperature, high-pressure cooking reduces cooking time to one-third of the conventional method. ・Functions as four appliances in one: boiling, steaming, simmering, and cooking. ・Cooks fluffy, chewy brown rice. [Accessories] Weight