Welcome，Please read the instructions carefully.Features:100% brand new and high qualityMouthpiece size good for high register and also C trumpetBest choice for you， or giving your friends is a good ideaIt is computer-aided design system and computer controlled lathe work together to produce the most precise mouthpiecesSpecifications:Material: Copper， Silver PlatedColor: Silver Length: 65mmEnd Outer Diameter: 26mmConnector Outer Diameter: 7mmPackage includes:1 x Trombone MouthpiecePlease contact us freely if any problem!