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If you want to get people's attention, simply start spinning one of these Whirly Sound Tubes over your head. The room will quickly fill with a loud melodic tone. Spin the tube faster and the tone will go higher. No batteries, no electronics just Bernoulli's Principles which demonstrate how the faster moving end causes air to rush through the tube and bounce around the ridges of the tube to create a unique sound. Get a few of these and you could see if you can create harmony by spinning each at just the right speed. Each tube measures approx. 30 inches.