Denis Wick ULTRA SM5U Large Shank Gold-plated Euphonium Mouthpiece (also compatible with Trombone) Please be aware that the plating on the rim and throat has worn off due to age. Please only purchase if you understand this. For size comparisons with other brands, please refer to pages 11-12 of the following site: https://www.shimokura-wind.com/img/accessory/brass_wind_mp.pdf #mouthpiece #euphonium #trombone #windband #brassband #brassinstrument