Our Air Mail Envelope Save the Date cards are great to customize to announce to guests the special date of a milestone birthday or anniversary, wedding, Bar Mitzvah or Bat Mitzvah. Air Mail Envelope Save the Dates are available in 2 sizes, 4" x 6" or 5" x 7" with matching size envelopes. Choose from 12 type styles and 24 colors when you customize this invitation for a special party. All custom invitations are printed on hiqh quality card stock and are sold in a minimum of 10 invitations. Additional invitations can be ordered in 2 invitation increments.