Model Number: Willie's PE Silver Plated Signature model supervised by Otihiko Fujita Inner Diameter: 17.6mm Outer Diameter: 25.25mm Throat Diameter: 4.1mm Cup Shape: U Cup Shank: STD (STD is written to be compatible with 80% of horns such as Wenzel Meinl, Hans Hoyer, Wilson, Paxman, and Holton, and it fit well even though I used an American shank instrument.) I purchased this one and a half months ago. I bought it for 33,000 yen. The rim is thin and comfortable, but I felt it was a little large, so I will not be using it in the future and am putting it up for sale. I think it's a good mouthpiece, with innovations in the cup space and resistance. There are some scratches on the shank because I attached it to the instrument several times. I will ship it in the original box.