Let the party preparations begin with the Iridescent Mermaid Party Invitations! These 4.5 x 6 postcard invitations feature an iridescent purple background and says You re Invited . There is a wavy border of teal scales all around and space on the other side of the card for all of your party details. The invitations are sold in packs of 24 and can be combined with our other Iridescent Mermaid Party party supplies. Invites for 24 party guests.