This set of 20 Metallic Silver Border Flat Cards and envelopes comes with Flat invitations that measure 5.5" x 7.5" each. This is perfect for printing invitation and announcements. They also work great for scrapbooking or photo frames. Additionally this set is Inkjet, Laser and copier compatible. Cards are made from 127lb text card stock and are mailable without a envelope - Requires First class postage. Design is printed on one side, while the other is blank. The 20 cards and 20 white envelopes are also Acid and lignin free.