In 2006, LEGO expanded its Exo-Force theme by introducing key chains featuring prominent characters. The Takeshi Key Chain (item number 851729) includes a non-detachable Takeshi minifigure affixed to a metal ring and chain. Similarly, the Hikaru Key Chain (item number 851818) presents a Hikaru minifigure attached in the same manner. Both key chains were initially priced at $3.49 upon release.
Summary
Gear Key Chains / Exo-Force Exo-Force Hikaru Key Chain set 4493747 was released on October 24, 2007, retailing for $3, it has since been retired. New, unopened sets are valued at $7, while used sets sell around $6.
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