Glass Blunt from GRAV. The Glass Blunt hand pipes feature a push design, silicone grommet, and ash catch mouthpiece. GRAV Glass Bunts are easy to use and clean. Just fill the GRAV blunt with ground weed, light and enjoy. Push in the mouthpiece to ash your blunt. The GRAV glass blunts are the perfect cheap and discreet pipe for quick tokes on the go.