Jupiter 700 Series TromboneJupiter JTB730A Student Tenor Trombone in Bb Jupiter has built its reputation as one of the worlds most teacher recommended student instrument brands through a simple formula: reliable build quality, consistent intonation, and instruments that are genuinely easy to play from day one. The JTB730A delivers exactly that a well made beginner trombone that gives new players the best possible start without the frustrations that cheaper instruments create.