Made by Atelier Tsubasa, original trumpet mouthpiece "3CS," throat 26, backbore 24. Compared to a BACH 3C, I felt that the sound was even more cohesive, with no unevenness in the resonance, making it a mouthpiece with a high density and a considerable degree of calculation. There are some minor dents on the rim side and slight shank scratches, but overall, I think it's in beautiful condition. The following is a reprint of Atelier Tsubasa's description: This is a Bach 3C size mouthpiece, a standard for all-genre mouthpieces. It was created with the aim of achieving "smooth playability," "smooth transitions across all registers," "good responsiveness," and "maximum sound efficiency with minimal effort." ~Specifications~ ・Rim The semi-flat shape of Mr. Kameyama's "MV 1-1/2C," which is loved by players around the world, regardless of their professional or amateur status, has been maintained, with the inner diameter adjusted to the 3C size. This shape provides both stability and control. ・Cup The depth of a modern 3C, with a bright and brilliant tone. ・Backbore #24 (Symphonic)