B ♭ pipe. Valve system is 4 pistons. Bell has a yellow brass diameter of 211 mm, a bore size of 12.8 mm (first to third) / 13.5 mm (fourth), silver plated finish.
Neo series. B ♭ Compensating system. The valve system is 3 pistons. Bell has a yellow brass diameter of 240 mm, a bore size of 13.2 mm (1st, 2nd) / 14.0mm (3rd), silver plated finish.
