Having fresh replacement strings on hand is essential for the professional, serious, or even part-time yo-yo-er. The more skilled you become, and the more complex tricks you are able to perform, the quicker you wear out your strings. Replace them whenever they become worn, broken, or dirty. This official Duncan™ pack contains 5 genuine 100% cotton strings in the assorted colors of the rainbow: red, orange, yellow, green, and blue (only purple is missing)! Get one now so you never have to stop practicing!
Discover a world of kaleidoscopic effects within this perfectly clear prism of the Light Crystal!
Learn Chemistry While Creating Sweet Treats
View the glory of space with this hi-tech telescope set!
This classic desk toy will keep you amused!
The Hoberman Sphere expands and contracts with a magical motion so fluid and simple that kids can't help but play with it for hours.
Great reference card for chemistry and physics students.