The Ralph Sauer Artist Model Trombone features our signature Ralph Sauer model screw-bell which enhances projection and allows use of a flat case that makes traveling a breeze! Combined with a dual-bore rotary valve and dual-bore (.525/ .547 inch) handslide, this trombone produces a large-bore sound with a medium-bore effort! #seshires #teamshires #iplayshires #shirestrombone #trombone #tenortrombone #basstrombone #tromboneplayer #jazztrombone #craftsmanshipmatters #handmade #brassplayer #crafts