The KANSTUL/Giardineli Screw-Rim Custom Trumpet Mouthpiece is a silver-plated brass mouthpiece designed for advanced trumpet players. It has a throat diameter of 27mm and an interior rim diameter of 16mm, with a medium cup depth. The mouthpiece is designed to fit trumpets and features a screw rim for easy customization. Made in the United States, this mouthpiece is a high-quality option for experienced trumpet players.