The Thomann TR 25 Bb-Pocket Trumpet is well-equipped to meet the needs of modern players. This trumpet features monel valves, which eliminate sharp bends in the air passage to facilitate smooth airflow. The trumpet has a brass body that is corrosion resistant. With the brass bell, the durability of the trumpet is greatly enhanced. The clear coat finish accentuates the overall look of the trumpet. The bell diameter of this instrument is 125mm. The mouthpiece and case are included with this pocket trumpet. This is an ideal pick for children. The small size allows them to hold and reach the valves easily.