Vintage kazoos. Made in USA. These whimsical designs are completely playable and have been revived exclusively for us by the same antique factory that made them over 60 years ago! Vintage Kazoos are constructed of metal with plastic mouth pieces. A kazoo player hums, rather than blows, into the instrument. The oscillating air pressure of the hum makes the kazoo's membrane vibrate.The resulting sound varies in pitch and loudness with the player's humming. Players can produce different sounds by singing specific syllables such as doo, who, rrrrr or brrrr into the kazoo.