The Euphonium, an aerophone, is classed as a Horn. The Horn family of instruments originates from the prehistorical animal horn and the hunting or postal horn, which consisted of coiled metal tubes. The Euphonium also belongs in the flugehorn family, a distinct sub-category of Horns with piston valves. Flugehorns first appeared in Austria, the early 19th century, when Horns were fitted with rotary piston valves. Their bores are conical and wide, producing a full and smooth sound. The family consists (in descending order, by pitch) of: the Flugehorn, the Alto Horn, the Tenor Horn (egg- or Tuba-shaped), the Baritone or Euphonium in B flat (egg- or Tuba-shaped), the Bass Tuba, the Double Tuba (a combination of Bass and Contrabass Tuba, with a rotary valve), and the Contrabass Tuba.