Bach Trombone/Euphonium Mouthpiece 5GL Gold Plated I'm selling this as I've switched mouthpieces after using it for a few months. It was kept in a case, so there are some slight discolorations due to oxidation, and some minor plating wear on the shank, but it doesn't affect the playing feel at all. Regarding the tone, this is just my personal impression, but I felt it had a slightly richer sound compared to the 5G. Since I don't have the original box, I will pack it in a Galax case and ship it. (The case is not included in the price.) Thank you for your consideration.