This is a Best Brass horn mouthpiece (5B). It has been used for a few test plays, so there are some minor scratches on the shank, but it is in almost new condition. It produces a deep and soft sound. The following is quoted from the product page: ■ Model Number: HR-5B ■ Cup Inner Diameter: 17.500mm ■ Cup Depth: Slightly Deep ■ Throat Diameter: 4.70mm ■ Backbore: HR-M ■ Manufacturer's Suggested Retail Price: ¥27,500 (tax included)