Boehm system Tuning: Bb 17 keys, 6 rings Body: matte ABS with metal ring Bore: 14,80mm Adjustable low F/C key Undercut tone hole, conical Ergonomic register key Adjustable thumb rest with ring for strap Blue steel springs Mouthpiece with ligature and cap JUPITER case light JPKC33Q Accessories Mechanism: nickel-plated, nickel silver