Product Number: SB50323
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A must have for explorations of sound and waves! Rods are an easy way to demonstrate longitudinal waves as opposed to transverse waves. Ideal for teaching about nodes and anti-nodes in standing waves. Includes 20 L rod, 30 L rod, bag of crushed rosin to lightly coat your fingertips, and teacher’s guide. Replacement powdered rosin bags can be purchased here: (SB51986M).