The professional design kazoo is an excellent music instruments, which can help the time and help them to enlighten your instruments. The rotating gear can adjust the tightness and change the vibration range of the flute film, so that different timbre can be adjusted depending on the playing breath. Features -Color:Black -Material:ABS -Size:10.90X2.80X1.20cm/4.28X1.10X0.47in -ABS material kazoo body, non-decolorizing, comfortable grip, easy to change flute diaphragm, through the knob can adjust the tone. -The rotating gear can adjust the tightness and change the vibration range of the flute film, so that different timbre can be adjusted depending on the playing breath. -Kazoo's head adopts groove design, the upper and lower teeth bite groove position when playing, saliva will not blow into the product. -The product has a wide range of uses and is suitable for all people who are interested in musics. -It has a simple design, but very practical in use, giving you a . Package list: 4 x Set of Kazoos