The slide whistle, which is also known as a swanee whistle, piston flute, or jazz flute is a flute like instrument that has a slider that allows the musician to change the pitch of the flute by moving the slider. It is most recognized as a sound effect for falling characters in cartoons and comedies. The slide whistle is easy to play, made of colorful plastic (please note that the color may vary from picture), and measures 9” long.