This is a pre-production prototype trumpet (no serial number) made in a Chinese factory. Unlike the mass-produced, entry-level Chinese trumpets sold on Amazon and Rakuten, this one has a high-quality finish. High-quality specifications include: * An over-ring is attached to the end of the lead pipe. * The tuning slide and 3rd slide water keys use solid brass machined parts instead of the pressed brass plate one-piece parts that are standard on entry-level models. * Rubber O-rings are installed on the 1st and 3rd slides. * The careful deburring of the air holes in the piston valves further demonstrates the quality of the instrument's finish. This instrument has been further refined in the workshop, implementing specifications comparable to high-end models. ★ Additional Modifications: * ◆ The 1st slide's saddle-type thumb hook has been replaced with a ring type. Our workshop believes that for optimal operability, the ring should be positioned as close as possible to the valve casing and at an angle that does not interfere with the right thumb. * ◆ The 3rd slide finger ring has been replaced. While adjustable ring positions are convenient, they can become loose and cause stress over time. By directly attaching the ring, a tighter operational feel is achieved. The gap from the valve casing is set the same as the Yamaha standard. * ◆ The pinky hook has been replaced with a ring type. By using fixed ring types for all three hook locations, unwanted vibrations at the ends of each part are eliminated, resulting in a clear, pure sound. Included Items: * Trumpet body * Mouthpiece * Case Condition: * ■ Used only for testing, it is in almost new condition. * ■ No dents. * ■ The silver plating is 100% intact. * *The unplated parts from the modifications have also been silver-plated in the workshop.* * ■ There is no sign of use on the piston valves or slides. ★ Customization to a reverse tuning slide is available for an additional ¥5,000. Please apply in the comment section.