F1 flugelhorn has a ML bore of 10.5 mm and a standard 400 gram brass valve section. The instrument is available with three different bell diameters of 150 mm, 160 mm or 170 mm. An absolute all-round flugelhorn, suitable for every type of player and styles of music. The F1 is the very first model made in the brass factories of Adams Musical Instruments. Serial number is 50658. -Specifications- Bell: Yellow Brass - 160 mm Bore: ML 10.5 Finish: Gold Lacquered Gauge: 0.60. Comes with a case.