Yamaha 11 Cornet Mouthpiece Please note that we judge the condition of this product to be: Used Good Please see pictures for quality, There will be some wear. This listing is for a Yamaha 11 Cornet Mouthpiece. We estimate that is has 90% of its plating. These are the approxamate mesaaurements rounded up. Cup Diameter = 16mm, Rim Width = 6mm, Cup Depth = 9mm, Shank Top Diameter = 9.5mm, Shank Bottom Diameter = 9mm, Shank Length = 26mm.