Yibuy Silver Trumpet Mouthpiece with Golden 4 Sizes Convertible 7c 5c 3c 1.5c Fits any model of trumpet,it gives great sound. Firm exquisite box packaged, to protect your mouthpiece not damp or damaged. Rich, compact tone of large volume. It is computer-aided design system and computer controlled lathe work together to produce the most precise mouthpieces