Plastic Wave Helix, 1 Each

The United Scientific® Plastic Wave Helix by United Scientific is a PVC coil spring for demonstrating longitudinal and transverse waves in the classroom. It measures 3¼″ in diameter and 2½″ tall and can safely stretch up to 8 feet, giving pulses large enough for a whole class to follow. Colors may vary. Used in middle school and high school physical science and physics.