GRAV - Clear 4-Inch Glass Hammer BubblerThe Hammer Bubbler by GRAV is subtle yet very stylistic water pipe making the design elegant and eye popping. With an X cut style diffused downstem, this glass bubbler provides perfect percolation and cools the smoke for a noticeably smoother draw. Control the side carb to mix additional cool air. Blown using borosilicate glass. *NOTE decal colors will vary!