This Carolyn Forsman original is even licensed! And, it slinks open to fit every wrist.

A Slinky® is a fascinating spring. What differentiates it from other springs is the amount of stretchiness compared to its mass, the ratio of 'spring pull' to 'spring mass' is small compared to a common spring. Scientists refer to this as the spring constant to mass ratio, written as "k/m".

The Slinky is so loved that there is an entire web site, http://slinky.org, devoted to nearly every conceivable aspect of this toy. [Do you remember the Slinky song?]

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