Made of nickel-plated brass, the American Plating Song Whistle has been popular since the 1920's and has been used in many classical and jazz compositions. Blow air into it while sliding the plunger up and down and the pitch changes. It's a fun and whimsical way to make music. The American Plating Song Whistle 302 has been featured in the 2003 movie "Seabiscuit"