This is the Grego Alessy Signature Model 5C trombone mouthpiece. It is silver-plated. I believe it is equivalent to a Bach 4G. I purchased it used, so I don't know its history, but there are scratches on the rim. It doesn't feel strange when playing, but those who are sensitive should refrain from purchasing. It will be wrapped in bubble wrap and shipped in a box of appropriate size. I am selling a large number of mouthpieces for organization, so please check my profile for others if you are interested.