Bavarian booster for French horn, trumpet or baritone/trombone Material: stainless steel Various versions available: - HR = horn (bore Ø 9 mm)- AR = trumpet (bore Ø 12 mm)- BR = baritone/trombone (bore Ø 13.2 mm) --- Manufacturer information according to GPSR:Anton RastAm Bahnhof 486573 ObergriesbachGermanyEmail: imehl.doc@googlemail.com