This is a set of clothes or accessories for figures.
From Good Smile Company:
The latest addition to the Nendoroid More collection is the third set in the "Face Swap" series! Bring out a whole new side of your favorite Nendoroid by giving them one of these nine special expressions!
Three of the expressions were selected from entries sent in by fans, while others are illustrated by manga artists Choboraunyopomi and AC-bu and illustrator Takashi Mifune along with three other original face plates! Try them on your favorite Nendoroids for all sorts of fun new display options!
Note: Images are for illustrative purposes only. The Nendoroid head parts and 'Nendoroid More: Dress Up Suits' are not included.
One box of this item contains a complete set of the possible types.