This is an old Laskey 30C gold-plated mouthpiece, for F tuba. There is some plating wear on the shank and a few black spots on the cup, but there are no dents and it doesn't affect playability. It has a large rim and a shallow cup. I'm selling it because I no longer use it. Quoted from the following site: ・Rim inner diameter: 32.89mm ・Throat diameter: 7.49mm This is a shallow cup model developed for F tuba. It has a clear, bright, and transparent sound, and can fully bring out the characteristics of a brilliant F tuba.