GRAV® Large Gravitron®

- Made from durable, heavy-duty 5mm borosilicate- Closed system keeps smoke contained and conserves bud- Platinum-cured silicone grommet protects glass touchpoints- Sleek design is super easy to clean - Includes a 19mm Funnel Bowl  The world's first all-glass gravity bong.  The Large Gravitron® takes the gravity bong out of the dorm room. With this classic design, gravity and pressure work together to give you huge, efficient hits. But unlike homemade grav bongs fashioned from soda bottles and buckets, this sleek glass gravity bong keeps things clean and classy.Since its original 2004 release (yeah, 2004) the Gravitron has seen major upgrades. This version is made from the highest-quality borosilicate, 5x thicker than before. You'll feel it in your hand—this baby is chonky. At the bottom, a platinum-cured silicone grommet protects the bottle where it contacts the base. Up top, a GRAV® 19mm Funnel Bowl is ready for packing. But you can swap out any 19mm male bowl to personalize your se