GRAV Labs, a glass works company based in the United States, has done it yet again. Introducing the GRAV Coil Shower Head water pipe. This bong was constructed with perfection and durability on the check list. Hand blown using a very strong glass which is commonly found in labs called borosilicate glass. As we examine this piece you will find a coiled shower head percolator which is implemented in order to provide extreme levels of filtration for the smoker. This unit ships with a 14 mm dry herb bowl which can be swapped out to be used with concentrates and other waxes.