Hecklephone Cousins are a type of oboe, which is a woodwind instrument. They are similar to the oboe in that they have a double reed and a conical bore, but they are larger and have a wider range of notes. The Hecklephone Cousins were developed by the German instrument maker, Heinrich Heckel, in the late 19th century. They are often used in orchestras and bands, as well as in jazz and other genres of music.