Card is printed on heavy white card stock Outside: Have a happy birthday with sprinkles on topInside: Hope your birthday is absolutely wonderful! Happy Birthday Dimensions: Each card has a single fold and measures 5 1/4" x 5 1/4" and comes with an envelope. Please note that square envelopes require extra postage. Buy six cards, get one free! (Free card must be of equal or lesser value.) Add seven cards to your cart and the amount for the seventh card will be subtracted from your total. Tip: If you would like to order more than three cards, get the best deal on shipping by combining your card order with a larger item, or a box of up to 20 cards.