Gleichweit 10-2, transparent. I purchased this for just under 40,000 yen six months ago at a shop in Tokyo. Facing: 22mm Opening: 1.28mm Compared to the standard black models, this produces a lighter and more refined sound. I think it works best with relatively thin reeds. I used it with Vandoren V12 size 3 reeds, for example. I am selling it because I have started using a different mouthpiece as my main one.