Here are two mouthpieces I purchased about 17 or 18 years ago. I bought these as my personal mouthpieces for playing the tuba and euphonium, and I used them for that purpose. The asking price is 17,000 yen (including shipping). The surfaces are dull, but they will become clean if polished. These are products from Nonaka Boeki. Bach mouthpieces are the most widely used in the world, from professionals to beginners. They improve the performance of poor instruments and enhance good instruments. They provide a rich sound, excellent intonation, good response from high to low notes, a rich resonance, even tone throughout the range, and moderate resistance that prevents fatigue. One silver-plated (SP) standard mouthpiece for tuba. One silver-plated (SP) mouthpiece for tenor/tenor bass trombone / euphonium (for small and medium bore).