This listing is for a Yamaha mouthpipe (lead pipe) assembly. It doesn't indicate what instrument it is for. It just says "SL" on the label and has the part number D0130700. It measures 7 & 5/16th's inches in length. I'm guessing based on the length that it is for cornet, but please don't take my word for it...make your own determination based on the information provided. This looks to be bare brass. This is a genuine Yamaha spare part. These are generally not available directly to the public, but rather must be obtained through a Yamaha dealer. This came from the closeout of an instrument repair business. It is brand new, but shows tarnish from years of storage. There are no dings or damage though.