Tilz Mc William Model #3 This mouthpiece is from Tilz, a long-established German mouthpiece manufacturer representing Europe. It is the model of Mr. Fergus McWilliam, a horn player with the Berlin Philharmonic. Inner Diameter: 17.5mm Bore: 4.0mm Cup Depth: Shallow Rim: Medium Wide American Shank This is a used item, so there are some small scratches, but it is in beautiful condition. Of course, there are no problems with playing.