Model Number: Willie's SJ S Silver Plated Milky Cup/Silver Finish (S Rim / S Blank) Inner Diameter: 17.45mm Throat Diameter: 4.2mm Cup Shape: U Cup Shank: STD *STD (Suitable for 80% of horns including Wenzel Meinl, Hans Hoyer, Wilson, Paxman, Holton, etc. I used it on an American shank instrument, and it fit securely.) Purchased about a year ago for 30,800 yen. Used occasionally for practice. It's a good mouthpiece, but I don't use it much, so I'm selling it. There are scratches on the shank from attaching it to the instrument. Will be shipped in the original box.