This is a 155mm downstem from Red Eye Tek, the part that carries smoke from the bowl down into the water, finished in the brand's signature metallic Terminator coat for a bit of iridescent sparkle in place of plain glass. It works as a replacement stem or as a way to add some shine to an existing setup. Check your bong's joint size and the length you need before buying, since a downstem has to match the piece. It's built in borosilicate glass. A good-looking swap if your current stem is broken or you want something with more character.