The Startone STR-25 Bb Trumpet Starter Set is an ideal choice for beginner/intermediate musicians seeking a complete solution: it features a gold-brass tubing with stainless steel valves, an ML bore (medium-large bore) for balanced performance, a copper bell with a diameter of 124 mm, and a total weight of approximately 1.18 kg. Musikhaus Thomann+2Musikhaus Thomann+2 The set includes a case and mouthpiece, offering immediate response & clear sound at an entry-level price, making it an excellent solution for schools, bands, or personal practice.