Yamaha 11 Trumpet 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 Trumpet Mouthpiece. We estimate that is has 99% of its plating. These are the approxamate mesaaurements rounded up. Cup Diameter = 21mm, Rim Width = 5.21mm, Cup Depth = 10.4mm, Shank Top Diameter = 12.48mm, Shank Bottom Diameter = 10.39mm, Shank Length = 51.96mm.