With beautiful tones, the Getzen 747 has a bore size of .547 inches that is essential for symphonic use. To change pitches, this Getzen tenor trombone uses the yellow brass blow tuning slide. The 8 ½ inch bell size of this Getzen handspun instrument is made of yellow brass for a good tonal quality. As a large bore tenor trombone, the Getzen 747 is one of two variants in the 700 series. The Clear lacquer finishing of the Getzen 747 makes it very durable. To lower the fundamental pitch, ...