A6 Envelopes meet all your social occasion needs. These invitation envelopes for 4x6 cards are thick, sturdy and opaque to keep your content private and confidential. You can also personalize the 4x6 envelopes with a doodle or your own stamp to express our heartfelt wishes, and they're Perfect for direct mail, letters, postcards, weddings, birthdays, baby showers, graduations, vacations, handmade cards, etc., they can be easily used for all kinds of social occasions. 4.72 "x6.49" Premium Envelope Benefits: Self-Sealing Flaps: each of these invitation envelopes comes with individual tape, just peel off the protective strip and you can use it easily, simple and easy to handle and not easy to damage the envelopes to leave folds Can be Scribbled and Printed: Because the original envelope flap is simple and generous, it gives us a lot of space to play, leaving the design and blessings on behalf of their own unique heart Thick Paper: This protects our privacy to a certain extent, and will not make the contents of the envelope leak, enhancing personal privacy.