Educational Innovations Inc: Sound Tubes (SciOnTheFly) HD

Sound Tubes are our absolute favorite sound toy. When spun in a circular motion, these tubes produce a tone. As the Sound Tubes are spun faster, the tone steps up in frequency. Due to the harmonics of the tube, there is not a gradual increase in frequency. Colors and styles may vary. Here is a direct link to the Educational Innovations Inc. site to purchase your very own Sound Tubes: http://www.teachersource.com/product/sound-tubes/sound-waves