The Chillum Glass Pipe Forest Series is made of borosilicate glass and has been hand blown by some of the top glass artists in the US. Many people refer to this piece as a "one-hitter". The glass is color changing. So over time, you will see pretty new green colors. Chillum Pipes are very easy to use. All you need to do is load the dry herbs in the chamber, light it and begin inhaling. It's discreet and hits like a beast.