1. Waterproof Protection: These envelopes have a certain waterproof function to ensure that your cards and documents are protected from moisture during transportation. Whether you are mailing invitations, announcements, or private letters, they are ideal choices regardless of the weather. 2. Self Adhesive Design for Convenience: Each envelope has a self adhesive strip at the. You can seal it quickly and firmly without getting it wet or using additional tools. This design is especially convenient for busy occasions like weddings and parties where a large number of invitations need to be prepared in a short time. 3. Quality Material: These A7 envelopes are made of thick paper and can withstand rough handling. The medium thickness ensures that they are not easily torn or damaged during mailing, providing a reliable option for sending important invitations, cards, or announcements. 4. Elegant Matte Texture: The envelope surface has a delicate matte texture, adding a touch of refinement and elegance. Whether it is a formal invitation, a private card, or a business letter, its noble design can enhance the overall texture and leave a deep impression.