Each of the 2M Series cartridges has its own individual sonic expression, and all five models together represent the ensemble of five classic variations:

2M Mono SE, 2M Mono and 2M 78 are a true mono cartridges for playing mono vinyl records
2M Red is an all-purpose cartridge that delivers open, dynamic sound with a slight touch of warmth
2M Blue adds more dynamics and resolution, sounds more open and reproduces more details
2M Bronze adds even more details and resolution but in a very evenhanded way that pays respect to all elements
2M Black is the best of everything, true to the groove with resolution and accurate insight into each recording