Phoenix Star 15'' Freezable Coil Bong Double 11 Tree Arms Perc PHX530 is made of 5mm thick boros glass with 15 inches in height. The glass bong consists of two parts: the straight tube base with double 11 arms tree percs and the detachable top part with glycerin coil. They are connected by a plastic kick clip for tightness and security. Before starting to inhale, you can put the removable glycerin coil into your freezer for one to two hours or even more. After that, you will gain a cooler flavor when you use this glycerin bong. The freezable bong is equipped with two 11 arms tree percs for smoother hits. The smoke goes through the undetached downstem to the double 11 arms tree perc to be diffused to be more bubbles. The more interactive spaces with water, the better filtration.