The Sandner 172 Soprano Solo is a keyless marching flute with the highest precision and purity of tone. It is the first purely cylindrical flute in the world and has a range of around three octaves and the characteristics of a concert flute. The full, pure tone of the fundamental notes and the octave ranges allow excellent interplay with other instruments for which Sandner flutes are known. The mouthpieces of the different sizes have been optimized and now have an improved response.