This is a mouthpiece from Atelier Momo. It's the MO52E model. It's for euphonium and trombone. It has a large shank (thick tube). There are some scratches on the shank, but there are no major scratches or damage. Please refrain from purchasing if you are concerned about minor imperfections. Atelier Momo mouthpieces are made by forging the hardness and condition of the metal material using a unique manufacturing method, and further acoustic processing is applied. This results in mouthpieces with excellent responsiveness, clear sound projection, and smooth transitions between notes. 52E: Cup inner diameter 25.8mm. Deep cup. Slightly larger diameter for a wider range of sound. Euphonium Trombone ATELIER momo Concert band Brass band