Size-- Your privacy will be well protected,A4 size white environmental protection envelope, made of 4 x 6 standard A4 size, with a square seal in the form of a glue booklet, made of 120 g kraft paper, thick and durable, with excellent sealing performance. | Print customization-- You can use laser or inkjet printers to solve them.These envelopes are suitable for printing. If you want to customize or mark your envelopes, choose this one. | Effortless Peel And Stick-- You don't need to stand licking envelopes and using glue or the water activators, which is time consuming and messy. | Sealing--Easy to seal peeling and sealing and closing operations, this type of adhesive is ideal for commercial applications, wedding announcements, and mailing. | Privacy Protection--These envelopes are also very suitable for direct mail, letters, postcards, weddings, birthdays, baby showers, graduations, holidays, handmade cards, business.These invitation envelopes for 4x6 cards are thick, sturdy and not see- through, keeping your contents private and refusing to leak. | Sealing--Easy to seal peeling and sealing and closing operations, this type of adhesive is ideal for commercial applications, wedding announcements, and mailing.