This instrument was designed by Mac Corporation, a Japanese musical instrument import and trading company, and manufactured in a Chinese factory. Mac Corporation also develops the "Brasspire" brand, a professional-grade line for professional players, as a higher-end model of J. Michael, so there is no concern about quality. This instrument is a silver-plated model with little use history, with no dents and almost 100% of the plating remaining, in excellent condition. Although it is a trumpet that can be used perfectly fine in its original state, the shape and mounting position of the 1st slide hook were corrected and adjusted because the hook position was too far from the valve casing, the hook shape was subtle, the angle was bad, and it interfered with the right thumb supporting it from under the lead pipe. This correction improved the left hand's hold and operability. In addition, the addition of a brace improved intonation control, and the response became more accurate even in the high register (although the workshop owner's skill is limited to HiG). (There is also no impression that the resistance has increased) *The improvement in response due to the correction of the thumb hook and the addition of a brace is the workshop owner's personal opinion. It does not apply to everyone. The accurately adjusted J. Michael TR-300S sounds surprisingly good. ★Customization Overview ・Customized with two braces ・Corrected the handling of the thumb hook ・Replaced the pinky hook *Please refer to the photos and specifications for details. ★Condition ・The silver plating is almost 100% remaining. It maintains the condition of a new instrument. ・Each slide and piston valve operates smoothly. ・Burrs and incomplete finishing from the Chinese manufacturing process were corrected after inspection. ・Solder marks from the rebuild remain, but they have been processed to be inconspicuous. ★Items for Sale Trumpet TR-300S Original case (with some damage) Mouthpiece ★Atelier Custom Trumpet ・A special trumpet provided by "Inst Trading," a trumpet customization workshop. ・This is not a resale instrument that has only been cleaned and oiled. ・Before listing, it was brought to an actual large ensemble, test-played, and the finish was confirmed.