This is an XO trombone mouthpiece supervised by Willie's. It's for large bore trombones and is silver-plated. The size is 5G. The following is a product description: ~About XO Mouthpieces~ This mouthpiece was created through a collaboration between global staff, XO trombone players, and Mr. Nakagomi of "Willie's Custom Brass," a mouthpiece maker. Of course, it's made in Japan. Developed based on old Bach mouthpieces (Mount Vernon ~ Early Elkhart era), it has resulted in an ideal mouthpiece suitable for modern players, regardless of lip size. It's a mouthpiece that can be recommended to all players, from beginners to advanced players. Willie's brand mouthpieces are expensive, but this one is available at an affordable price. We highly recommend it to those who play in the same brass band or orchestra! Currently, it's difficult to obtain and is a popular 5G size. It shows signs of use, but there is no damage that would affect playing. It does not come with a box, so it will be wrapped in cushioning material for shipping. Thank you.