They're made of Durham-Schott glass (schott is German for pyrex, I believe). They're hard to break, and hit very strong.
graph Reviewed by graph on . Roor's what is so good about roor compared to any other piece? is it just the glass on glass, w/ the ice catcher? that's the only difference i notice... if you've ever smoked out of one, please let me know how it was, if it's worth spending an extra 280 bucks on? peace! slim! it's 420 all day where i live! Rating: 5