Wedding RSVP Cards featuring one of a kind custom designs. Once you’re ready to send out wedding invitations, simply choose a wedding invitation design as well as an RSVP card. Also sometimes called “reply cards” or “response cards”, RSVP cards are smaller-size cards. Mail them along with the wedding invitation. Guests complete the card and mail it back. This way, you can plan accordingly! Our cards are 4.25″ x 5.5.” They are available in portrait (vertical) or landscape (horizontal) orientations.