Magnetic Medallian aromatherapy metal pendant with on a 20" stainless steel chain with 2" extender.  Pendant opens, (see image) to hold 1 black and 1 white felt pads.  Add a drop of essential oil to the felt pad to enjoy the scent.  Oil not included.  Available at most craft and health stores
 
 
Handmade in the USA of Chinese components.
Not intended for children 12 and under.