About this item 20 Pack 9×12 White Envelopes: This set includes 20 high-quality 9×12 inch envelopes, ideal for mailing important papers, business documents, booklets, catalogs, brochures, magazines, and books. Sufficient quantity to meet your mailing and storage needs. Self Adhesive Seal: Featuring a Release & Seal peel strip, these envelopes provide a hassle-free sealing experience. Just peel off the strip and press down for a secure, permanent seal, ensuring the contents remain safe without the need for glue or water. Thick and Durable Construction: Made from 100GSM double adhesive paper, these envelopes offer excellent rip, tear, and puncture resistance. The sturdy and opaque design protects sensitive information and critical documents during mailing. Printable and Customizable: These blank envelopes are compatible with laser and inkjet printers, allowing you to print addresses, shipping labels, letters, and graphics without worrying about smudging or jamming. They are also suitable for DIY projects. Versatile Use: Perfect for school, office, meetings, and more, these envelopes provide extra protection for mailing, storage, and handling. Ideal for sending files, offers, catalogs, and other documents securely and professionally.