An intriguing experiment in the science of sonic waves. When you wave these sound tubes around, you produce a spooky whistling sound effect. You can manipulate the noise by varying the speed and trajectory of motion. Each unit includes 24 pieces in colorful display box. For ages 5+.
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TrustScore 4.5 | 7,300+ reviews
Meera L.
Smooth transaction and product arrived in perfect condition.
3 weeks ago
Ali H.
Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.
