YAMAHA horn mouthpiece 34B. Used only a few times for testing. There is some discoloration of the plating due to aging, but there are no major scratches on the rim or shank. This is a fairly large size among Yamaha mouthpieces, so if you feel that your current mouthpiece is too tight, you might want to try this one. Rim inner diameter: 18.07mm Throat: 3.90mm V cup American shank