Key Chains are LEGO novelty items that are based on many different themes. They come in several different forms, including minifigures, mini sets, or single bricks. They all has a special metal keyring attached to them, through which they may be attached onto a key chain.
Minifigure key chains are similar in appearance and playability as most minifigures, with the exception of having their parts glued together and having a key chain screwed into their bodies, normally in their heads.
Mini set key chains are built of real bricks. They are unable to break apart, due to special glue-based affixing methods, although it is possible, using the right methods, to take them apart.
These are the simplest key chains, and comprise a single brick, normally a 2x4, affixed to a keyring.
- If the right equipment were had, most minifigure keychains could be converted to a normal Minifigure. Some methods, however, could damage the initial Key Chain design permanently.
- Key chains are part of LEGO's promotional products and follow a different numbering system than standard sets. This system has changed over time.