- From the BZ Series - Concert Line - Nickel silver Zirnbauer valve mechanism with bronze valves - Gold brass bell model GL91 Ø: Ø 160 mm - One-piece valve connection and tuning slides - Conical bore Ø: 11.05 - 11.20 mm - Conical rotary valves - 3rd Slide trigger - Valve slides and leadpipe made of gold brass - Non-lacquered - Polished EUR 3699.00 - See more - Buy online