Laskey Alessi 67 Solo Trombone Mouthpiece Used from my second year of high school until I took the music university entrance exams. I'm selling it now because I've switched mouthpieces due to various circumstances. It might be a good idea to consider the compatibility with your instrument and compare it with the size of the mouthpiece you are currently using. It's a really good mouthpiece, but it's challenging to master. Original price: 36,300 yen Inner rim diameter: 26.72mm Outer rim diameter: 40.43 mm Throat diameter: 7.16 mm