Kingma Flutes specializes in making the 'lower' sounding flutes, producing a wide range that includes Alto-, Bass-, Contrabass and Sub-contrabass flutes. Kingma flutes are hand-made Kingma-team innovations have led to the development of a line of instruments with increased musical potential, begun with the development of the open-hole alto flute. Following the innovation of the 'Key-on-Key mechanism' and the patented 'Kingma System®', a series of open-hole and quarter-tone Alto, Bass and Contrabass flutes were created.