i have a us tube 9 mm and one time a person i know let it droped and broke my new downstem and alex k slide..it was the 3rd glass they had broken in 2 weeks, i picked up the us tube and smashed what remained of the bowl, and i mean hard man the glass looked like dust after i smashed the us tube against it. HTe us tube after all of that only had a minor scratched, i mean amazing i hit it as hard as i could have hit it, with all my anger and frustration and the thing survived. i talk with experience man get a us tube and work up from that, that tube will never fail you. I think u can be in your car and throw it out your window that that thing will somehow survive.