i could not agree more with what mada is saying...It gets old smoking out of the same piece with little to no variation from 20 years ago until now in the Roor tubes they have not even pushed the limits of creativity.... just imagine if Roor came out with fixed Stem pieces...how many people do you think would buy these...probably Tons..i know i would get one just to add to my collection of different styles and types of diffusion.