1. Waterproof Protection: These envelopes have certain waterproof properties to ensure that your cards and documents are protected from moisture during transportation. Whether you are mailing invitations, notices or letters, they are ideal choices regardless of the weather. 2. quality Materials: These A7 envelopes are made of thick paper and are designed to 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 notices. 3. Elegant Matte Texture: The envelope surface is treated with a delicate matte texture, adding a touch of elegance and sophistication. Whether it is a formal invitation, a card or a business letter, its elegant design can enhance the overall presentation effect and leave a deep impression. 4. Selfadhesive Closure for Convenience: Each envelope has a selfadhesive strip at the closure, allowing for quick and secure sealing without the need for wetting or additional tools. This design is extremely convenient for busy occasions such as weddings and parties where a large number of invitations need to be prepared in a short time.