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GTB-300 Student Tenor Trombone. The GTB-300 is a solidly constructed student to intermediate instrument intended to give the learning musician an affordable instrument to develop his or her skills on. It is built with quality materials and craftsmanship that ensure it will withstand the rigorous student treatment an introductory instrument can sometimes undergo. In addition to a gold brass Venturi tube and a rose brass bell, it features a medium .500 in. bore, rose brass main tuning slide with nickel silver main receivers. The package is made complete with a molded ABS case and a five-year warranty.