Hi Bernd, I just wanted to let you know that the S8 cello bow I purchased from you  a little over a year ago has more than met—if not exceeded—all my expectations! I have absolutely no arm pain anymore, and I can once again practice for hours at a time without any physical bow arm issues, for which I am very grateful. In addition, the bow is also helping me significantly improve my bowing technique. Traditional Pernambuco wood bows still seem to have the upper hand, but perhaps that will change one day. So keep at it, and keep working on developing your carbon fiber bows so that one day even the professionals—who are still very skeptical—will be convinced! All the best and continued success, Michael Frommlet