The heat controller is made of aluminum and is coated with chrome. Thanks to this the device has a longer service life, retains its appearance longer and efficiently consumes heat from coals. Evolution has the same bottom diameter as standart Heat Keeper. It is designed specialy for 3-4 cubic coals with 25mm side size.
Heat Keeper is a heat managment devise which is used with coals instead of traditional foil. It helps to improve hookah preparation and makes it more difficult to burn tobacco. Sometimes if you use foil it hapenes that tobacco recieve too much heat from the coals, that calls "burned tobacco".