Ebony; ivory mounts and mouthpiece. This French flageolet from the mid-nineteenth century is an example of the four-keyed variety of the instrument, the two basic keys being those for b-flat and d-sharp. The lowest note is a, but the music is often transposed down a twelfth. The lower b-flat cannot be obtained by fork-fingering and the d-sharp key facilitates fingering in rapid passage-work. The key mounted on the side of the instrument is mainly used as a trill key and described as petite clef des trilles. The sponge to absorb moisture is contained in the second joint of the instrument.