Phoenix Star 17.2 Inches Freezable Coil Glycerin Bong PHX579 is a combination of unique design and perfect function. This glass bong consists of two parts: the bottom base with showerhead perc and the top part with glycerin coil. They are connected by a plastic kick clip. The freezable bong comes with a unique pyramid shape showerhead perc. The smoke flows through the undetached downstem to the showerhead perc to create more bubbles and more interactive areas with water for better diffusion. You can put the removable glycerin coil into your freezer for one to two hours or even more before inhaling. After that, you will gain cooler and smoother flavor via this glycerin coil bong.