【Model Information】 SM4XR ULTRA-XR GP Euphonium Mouthpiece SM4XR Cup Inner Diameter: 26.00 mm Rim Width: 6.30 mm Bore Size: 7.40 mm A sports model with particularly high potential in the high range. 【Material Characteristics】 Gold-plated finish provides high durability and a beautiful appearance. It also has a positive effect on sound quality and improves comfort during performance. - Model: SM4XR - Material: Gold Plated - Type: Mouthpiece - Application: For Euphonium The following are excerpts from sales sites and other sources describing the features of this mouthpiece. The latest model supervised by Steven Mead, "ULTRA-XR Series" This mouthpiece was created in collaboration with world-renowned euphonium player Steven Mead and Missa Mead. This is the XR series, which further evolves the popular euphonium mouthpiece "Ultra 4X". The rounded rim, new inner shape, and slightly shallower cup depth provide a better playing feel, like a "sports model". It has great potential in the high range, and a new playing feel is achieved through ease of blowing and a transparent tone. The mid-range is even more powerful, and in the low range, the sound is very clear due to the different sound weight compared to the conventional "ULTRA X", adding power to each phrase. Thank you for viewing.