His factory produced clarinets, fifes, drums, basset-horns, bassoons, oboes, flutes, flageolets and brass instruments. Down through 1900, they were also marketed as "Clarke London Flageolets" or "Clarke Flageolets". The Boehm system was also adapted for a small number of flageolets. These instruments are called "English flageolets" and were eventually produced in metal as tin whistles. Flageolets were made until the 19th century. Flageolets have varied greatly during the last 400 years. Flageolets were generally small flutes, however their lowest note varies.