Thank you for viewing. This is a YAMAHA 17B4 trumpet mouthpiece. No box included. ■ Rim Inner Diameter: 17.3mm ■ Throat: 3.65mm A YAMAHA trumpet mouthpiece. The standard series, made of brass with silver plating. The large rim diameter and slightly shallow cup produce a powerful sound. Recommended for first chair players in an orchestra. It's clean, having been played only a few times. Thank you!