The Jupiter 673 Bb Bass Clarinet features a durable 2-piece plastic body, nickel plated nickel silver plateau keys, .945" bore, undercut tone holes, in-line trill keys, adjustable octave key, and low Eb on the bell. A wood frame case accommodates assembled two-piece body section. "Being a studio musician who is regularly called for recording sessions in the jazz idiom, I recently used the new Jupiter 673N after I found myself booked for a record date requiring bass clarinet