The MJC Compensating Cimbasso was developed to fill the need of players who are used to a 'Blakey' compensating valve system, the same key and valve system being extremely useful when quick changes need to be made between the two.

The bore size matches that of a British compensating Eb or F, and is available in Eb or F.

It is available with the 4th valve as part of a 4 valve block or as a rotor for the left hand, or, indeed, for the right thumb.