YAMAHA JAPAN 17B4. This was included when I purchased a musical instrument around September of this year. It was used for a few minutes for a trial and then cleaned and stored. New List Price: 7,700 yen (tax included) TR-17B4 Cup Volume: B Rim Inner Diameter: 17.30mm Throat Diameter: 3.65mm A good combination of a large rim diameter and a slightly shallow cup. It has a powerful sound and is suitable for the first player in an orchestra. (Reference: YAMAHA JAPAN)