Willson K56S Bb-Euphonium; Key of Bb, compensating system; .590" (15mm) bore; yellow brass upright bell 11.5" (290mm); 3 stainless steel top-action pistons + 1 side piston (left-handed); nickel leadpipe; large shank receiver; silver plated; incl. mouthpiece and deluxe backpack case with straps