Crafted from durable borosilicate glass, the WELLCANN 18" Glycerine Detachable Glass Bong provides two levels of cooling and superior filtration. It freezes quickly and stays frozen for extended periods. Boasting a 18" height and a 7mm thickness, this bong also features a thick bowl for a 14mm female joint, a 6" diffused downstem, an extra thick bottom, a glycerin coil chamber, and a tree-arm percolator.