This is a tuba mouthpiece from the Buzz brand, formerly produced by Nakajima Gakki. Originally, the cup and shank could be disassembled, but they are now stuck together and cannot be separated. Aside from that, it's in very clean condition with no dents. It's a mouthpiece based on the world-renowned Conn Helleberg, with the same inner diameter (32.8mm). However, the cup is deeper and the rim is thicker than a Conn. It seems to be able to produce a heavier sound while maintaining the dark sound characteristic of Conn, with a clearer response.