This is the o-ring to be able to make repair of the voice box on a Chatty Cathy.  These disintegrate over time and cause the Chatty Cathy doll to no longer talk.  95% of the time that is why the doll no longer talks.  There are many websites showing how to do this repair available on youtube.   You need to have this part though to complete the repair.  Shipping is minimal fee as it is such a lightweight item.  $1 in Canada and $2.50 to USA.  25 cts extra for each extra one added to shipment.