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11 in stock
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Recommended for ages 2 to 5 years


This is not a typical stack-and-nest toy.

The weirdly-shaped pieces can be stacked and arranged any way you want. The vibrant colors are fascinating. The unique contours are inspiring!

But then, nest them together, pull up on the smallest, and let your jaw drop.

The whole thing stretches into a tall, spiraling tower! — It's like magic!

Beautifully un-intuitive design inspires hours of tactile discovery with SpiroKu.


  • SpiroKu by Fat Brain Toys® is a unique stacking cylinders that stretch into a tall tower.
  • Encourages fine motor skills, spatial reasoning, experimentation and creativity.
  • Stack and arrange cylinders creatively.
  • Vibrant colors fascinate the eyes, while unique contours inspire imagination.
  • Nest them together, pull on the smallest and stretch them into a tower!
  • Includes 9 cylinders sized big to small.
  • Measures 22 inches tall when stretched into a tower.
  • Largest cylinder measures approx. 4 inches in diameter.
  • Made from high-quality ABS plastic – BPA-free.
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