This is a bass trombone mouthpiece (leadpipe) made by Edwards, an American brass instrument manufacturer. These are the B1 and B3 leadpipes (1 and 3) that came with the purchase of an early-rod (serial number in the teens) Markey horn. Brass leadpipes. New retail price: 29,150 yen per piece (58,300 yen for two). I plan to sell them as a set of two, but I will also sell them individually. Although I haven't used them since I bought them, there is some oxidation due to age. However, there are no problems with their use. These are rare Edwards leadpipes from a bygone era, which are becoming increasingly difficult to find. Why not consider them?