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. The glycerin coil is attached to the flared mouthpiece, which adds an airtight seal as you inhale. In order to properly use the glycerin coil, there is a simple process you must familiarize yourself with. 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. Put more simply, the condenser coil and the glycerin surrounding it are responsible for cooling your smoke for a less harsh inhale. This top chamber is held in place by a black keck clip. Just the cooling mechanism alone makes the Nucleus Glycerin Coil w/ Colored Inline Perc Bong a really unique piece. This scientific glass bong comes with a free 14mm male bowl with a colored inside, which fits into the 14mm female joint. After you light up your dry herbs or tobacco, your smoke travels into the gridded inline perc. This perc's color matches the glycerin coil and the glass milli located on the tube. Enjoy icy cold hits without the mess of putting ice in your bong; the Nucleus Glycerin Coil w/ Colored Inline Perc Bong is a great choice.