Phoenix Freezable Bong 18" Sprinkler Grid Perc Freezable Coil Bongs Allow For The Smoke To Cool, Allowing The User To Take A Bigger Hit Of Tobacco, Includes A 18mm Bowl.  Put the Freezable Gylcerin Coil In Freezer For 1 Hour And Use.  The Bong Includes A 18mm Male Bowl And A Gridded Sprinkler Perc.  The Glycerin Coil Comes Pre Filled In Sealed Chamber.  Never Need To Refill Glycerin.   5mm Thick Glass  18" Tall Bong 18mm Joint 34mm Freezable Joint (Removable Freezable Coil) Phoenix Star Brand New Style Grid Sprinkler Perc Makes A Great Water Pipe