Jupiter JTR700A Student Trumpets - BbRepresenting a good value for the beginner trumpet player, the JTR700A Jupiter trumpet boasts a 4. 8" bell and 460" bore, which produces a powerful tone for a student trumpet. The lacquered brass body of the JTR700 Jupiter trumpet is manufactured using state of the art technology to ensure that the instrument sound produces an accurate scale, tone, and intonation. We think the Jupiter JTR700A is one of the best beginner trumpets available today and is