Zenco Duo Glassware Replacement Cups - x2 Per PackREPLACEMENT CUPS The Zenco Duo is a unique dry vaporiser with no water chamber, just cups that fill up with vapour that you can pass around or enjoy all by yourself. A dual use device that allows for 510 threaded cartridges or you can thread on the included vapour coil bucket and vape herbal concentrates extracts. The premise is quite simple to provide a party friendly vape experience for those that like to show off a little! x2 Glass cups are