A great lead mouthpiece roughly in the 7c to 10.5c range. flattish rim with a very soft bite and shallow V style cup.
After a bit of adjustment I found this mouthpiece gave a nice big dark sound in the low and middle register (at least by lead mouthpiece standards) and remains very consistent in blow up to high register. Nice and open blowing up to DHC. Worked well for lead, jazz and some small group playing.
I found the rim a bit too polished/slippery and needed work to adjust to a more open blow than I am used to with GR mouthpiece. It's also pretty shallow so watch out if you bottom out easily.
I tried this on an Eclipse and a Bach 43. Worked well on both.