The Arizer glass mouthpiece is made from high quality borosilicate glass. It measures 70mm in length, and is key to delivering that extra refreshment from your Arizer.It is compatible with both the Arizero Solo 2 and Air 2. There is a silicone cap to protect your accessory during shipping. In addition, this hood also helps in cleaning your tube. Simply place isopropyl alcohol with some salts inside the mouthpiece, close the tip of the cap and shake quickly.