This is a mouthpiece for a flugelhorn. Standard Series FH-13F4 Manufacturer: YAMAHA (Yamaha) New List Price: ¥6,380 (tax included) Purchased new and used for only a few minutes, it's in near-new condition, but it is still a used item, so please purchase a new one if you are looking for perfection. Comes with the original box. Rim Inner Diameter: 16.66mm Throat Diameter: 4.30mm Manufacturer's Description: This model is a slightly smaller version of the professional 14F4. It is particularly easy to play in the mid to high range and offers excellent flexibility. It's a convenient size to have in addition to your main mouthpiece. Recommended for those who usually use a 5C to 3C class mouthpiece on a trumpet. For those who find the 14F4 too large, or those who want a mellow sound. Personally, the transition from trumpet feels relatively natural.