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Extensor Construction Kit

Article number: 165359
Availability: In stock (30)
The Extensor Construction Kit lets you build expanding structures from Y-extensors (extensors with three arms) and X-extensors (extensors with four arms).  These build structures with different angles and geometries.  Extensors can be connected together to build larger expanding structures.  You can also add springs to make your mechanisms jump open!  Ages 13 and up.
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