Joints on-the-go are best when shared with friends. Extra mouthpieces from GRAV make it easy for the whole group to sample a bit of everything. These mouthpieces are made from borosilicate glass for the cleanest hits. The silicone grommet creates an airtight seal between the mouthpiece and the joint so you dont lose any of the good stuff. Includes one borosilicate mouthpiece and one food-grade silicone grommet.