SCHILKE 50 large shank mouthpiece. The original box indicates "Bass Trombone." I used to use it with a BESSON euphonium. Recently, I haven't had many opportunities to use it, so I hope someone interested can make good use of it. I have handled it with care, so I think the condition is good. Please refrain from purchasing if you are looking for a perfect item or are very particular, as it has been stored at home for a long time. Thank you. Added 2/26 I retook the photos and updated them.