This is a Tilz McWilliam 2 mouthpiece. I bought this when I was deep in the mouthpiece rabbit hole, but I've settled on a different mouthpiece, so I'm putting this up for sale. Cup Diameter: 17.5 Bore: 4.2 Cup Depth: Medium Shallow Shank: European There are minor deformations on the rim and shank, but they are not at a level that would interfere with playing. Thank you. *If there aren't many interested buyers, I will reconsider the price, so please refrain from negotiating discounts. *There is no original box. It will be shipped in bubble wrap.