GRAV® DECO BEAKER IN SILICONEPRODUCT DETAILS Looking for the premium smoking experience of a traditional glass bong and the durability of silicone? The GRAV Deco Beaker in Silicone gives you the best of both worlds: a clean smoke and the safeguard of food grade silicone to protect your investment. Because youre a savvy consumer. Unlike other silicone bongs that can seriously spoil the flavor of quality flower, this piece is primarily borosilicate. So you get the super clean hits