Bagua Wu Lou Charm.

The Wu Lou is associated with the God of Longevity. It is a trusted symbol of longevity & good health, also bringing prosperity and abundance of blessings due to its shape resembling the number 8. The Wu Lou is also believed to contain the elixir of health, vitality, and immortality.

To ward off illness, place or hang one Wu Lou on each side of your bed. Good charm to hang on room's knob doors. 
Another placement is in the center or east sector of your home or room, corresponding to the health area or the sector corresponding to your health direction (according to your KUA number). 

This hanging metal Wu Lou measures 7" L. Brass quality coins. Brass Wu Lou featuring the Bagua, measures 1.75"