Custom series B ♭ / F compensating system. Valve system is ...
Neo series. B ♭ / F compensating system. Valve system is 4 ...
B ♭ pipe. Valve system is 4 pistons. Bell has a yellow ...
B ♭ pipe. Valve system is 4 pistons. Bell has a yellow ...
B ♭ pipe. The valve system is 3 pistons. Bell has a yellow ...
Neo series. B♭ compensating. The valve system is a ...