This auction is for three vintage Vincent Bach Corp. mouthpieces. I don't know what instrument they were made for. Maybe a cornet or a trumpet. They are the same size and style but are marked with three different styles. 10 1/2C, 1 1/2C and 5B. They measure 3 3/8" long with a 1" diameter at the wide end and 3/8" diameter at the narrow end. All three for one amount.