The Stella Glass Mouthpiece is a premium borosilicate mouthpiece, carefully contoured for optimal ergonomics. Not only does the glass offer a window to your vapor path, it also provides a cool, smooth touch to your experience. A traditionalist knows thereu2019s nothing better than glass.The glass is accompanied by a premium adapter to fit on your Stella with medical grade silicone o-rings for a perfect, airtight fit. Glass can easily be removed and cleaned to keep your unit looking pristine. If youu2019re looking for that extra premium touch to your Stella, the glass mouthpiece is the perfect compliment.