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!
Use this kit to introduce electromagnetic principles in the classroom setting!
This magic bird defies gravity before your very eyes!
This genuine meteorite is great for the rock collector in your family!
This glass Erlenmeyer mug makes an excellent gift!
Great reference card for chemistry and physics students.
Is it a demonstration of a scientific law or a work of art?
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