Afgan Kazan with a black coating, the material is aluminum. 
High-quality pressure device, safety valve, steam release valve.
Afghan cauldrons work on the principle of a pressure cooker - they save time by preparing the product faster, preserve vitamins.
They differ from a conventional pressure cooker by the thickness of the metal, the rounded shape and the clamping device. Convenient handle on the clamping device and light weight, allow you to use the cauldron on hikes and when going out into nature. 
It is convenient to mix food in a cauldron, just put it on its side and rolled it on the surface, you do not need to open the lid often. 
The useful volume of the cauldron is 65-80%, when loading more than this norm, there is a possibility of clogging the valve.