* Unique 3D puzzle combining intuition and mathematical prowess
* The Brainstring brain-teaser features a movable ball with a 360° spin
* Twist, turn and slide the plastic spheres to rearrange strings and unravel the knot!
* Puzzle is solved once strings are completely separated and not touching
* Great for travel!
* 5"l, 5"h
* 9.6 oz
Content & Care:
* Plastic, elastic
* Wipe clean