Hans Hoyer G10A-L1, F/Bb-Double horn, Geyer style, 4 Rotary valves with F/Bb switching valve, 3B Ball bearing linkage system, Bore: 11.90 mm, Bell diameter: 310 mm, Ergonomic adjustable thumb lever and finger hook, Detachable bell (M), Gold brass leadpipe, Body from brass, Coated with a layer of clear lacquer, Incl. Mouth piece and case, Made in Germany