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The Grav Fill-Your-Own Glass Joints 7-Pack combines convenience and efficacy. The bong is made of clean, high-quality borosilicate glass and is outfitted with everything you need to get the most out of your concentrates. Grav Fill-Your-Own Glass Joints 7-Pack Features and Specifications: 7 double-capped glass cartridges 1 glass mouthpiece with a silicone grommet Plastic carrying tube