I have an alto piece that was ok on my mk. VI, but really squirrely on my 6M. Needed major surgery. Not to be unkind, but there are much better choices for hard rubber. Check out Jody Jazz. Listen to Prez. He could get a killer sound out of what looks to be a Brillhart. (at this point somewhere the Knights nod wisely...) Link, Berg, if you have the bucks, Lamberson, there are lots of good ones. What kind of sound is in your head? Give us a description and somebody will surely point you in a good direction.