Singing Rods Set/2
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A must for explorations of sound and waves, these rods are an easy way to demonstrate longitudinal waves as opposed to transverse waves. They're ideal for teaching about nodes and anti-nodes in standing waves. Sold as a set of two; approx length: 20" (500mm) and 30" (750mm). Comes with a Teacher's Guide with detailed instructions and a bag of crushed rosin to lightly coat your fingertips.