The Rock-A-Stack keychain features the familiar rainbow rings and rocking stack base all in a detailed miniature form.  The rings slide up the post, just like the original, but are fixed by the keyring for no loose parts.

The incredibly detailed Rock-A-Stack measures about 2.5" high by 1.5" wide and is attached to a quality metal keychain that includes a metal clasp.  It even has the Fisher-Price logo on it.  This is a genuine Basic Fun collectible and is brand new and sealed in the manufacturer's package.