This glass bong from Nucleus provides a tasty cold hit. However, the Nucleus Glycerin Coil w/ Colored Inline Perc Bong uses a different mechanism than an ice catcher to cool the smoke down. The Glycerin Coil w/ Colored Inline Perc Bong's main attraction, the glycerin tube, is responsible for cooling the smoke before it reaches your mouth. First, put the entire condenser coil in the freezer until you are ready to smoke. When you have decided that you are ready to smoke, take the tube out of the freezer and place it into the base of the bong. At this point, the glycerin surrounding the coil is quite cold. The glycerin works to make the coil colder. The coil, on the other hand, serves the sole purpose of directing the smoke to your mouth. It is shaped like a coil because it will take longer to reach your mouth, as opposed to a straight line. The longer amount of time it takes to reach your mouth, the longer the smoke has had the opportunity to cool before you inhale. Just the cooling mechanism alone makes the Nucleus Glycerin Coil w/ Colored Inline Perc Bong a really unique piece.