Bruno Tilz Neustadt/Aisch Mouthpiece for Long Cornet 6C Cup Diameter: 16.5mm Throat Diameter: 3.6mm The size is the same as Bach, but the shank is slightly longer and thinner. Personally, it produced a lighter sound than a Bach. I purchased it as a used item and have only test-played it since then. There are some areas of blackening in the grooves and engravings, but the rim etc. are in good condition. No box included.