Willson Q90S Bb-Euphonium; Key of Bb, compensating system; one piece seamless yellow brass bell (11.5"/290mm); 3 stainless steel top-action pistons (.590"/15mm) + 1 side, left-handed piston (.669"/17.75mm); nickel leadpipe; large shank receiver; silver plated; incl. mouthpiece and deluxe backpack case with straps