B/F tenor trombone for children

B/F tenor trombone configured for children having shorter arms than adults, comprising a sound part and a slide with a length shorter than a length of a slide of a conventional trombone, the slide composed of an inner slide and an outer slide being movably disposed thereon, the sound part including a completely circumferential tube bend, wherein the total length formed by sound part and slide has a tubing length Ls1+Ls2+Ls3+Lz1+Lz2+Lz3, wherein Lz1, Lz2, Lz1, Lz2 correspond to lengths of straight parallel sections and Ls3, Lz3 correspond to semi-circular tube bends, and wherein in the 1st register, the slide has a tubing length Lz1+Lz2+Lz3 of less than 150 cm, and wherein the sound part has a tubing length Ls1+Ls2+Ls3 of more than 125 cm, wherein the total length formed by sound part and slide is the same as that of a conventional trombone.