Trombone, Euphonium, and Baritone Horn Mouthpiece Denis Wick 4AY Small Shank Silver Plate Rim Inner Diameter: 26.00mm Purchased new one year ago. I mostly use a large shank mouthpiece, so it hasn't been used much and is in good condition, but please understand that it is used. I felt it worked very well with the Yamaha YEP321. It does not come with a box, so it will be wrapped in bubble wrap for shipping.