Bongs are the most ancient form of waterpipes, in the far East it has been in use for centuries. There were numerous improvements recently: the smoke can be cooled by a vortex generated with the form os the bong, or by letting it through a labirinth that works az a heat exchanger.
The simpler forms of bongs are usually made of acryl. It has a great durability, light weight ang user friendliness. This pipe has a special pattern for a special smoke!