It's a very nice piece of kit! A small stainless tube which you fill with activated carbon. The distillate drips through and it produces very pure alcohol!
It has a micro screen to prevent small particles of charcoal washing through into your alcohol and the tap allows for a slow drip for the best filtration.
Stainless mean that there is no contamination from the metal.
Made by fuselexnano
It's a nice compact size, those are 2p pieces just for scale!
The red bit is the tap, the ends unscrew so you can replace the charcoal easily.
It uses the standard granulated charcoal you can buy off this page!