OEM Quality Park Reveal-n-Seal Double Window Envelopes feature a unique adhesive that provides a strong, moisture-free secure seal and an extended shelf life. These envelopes have no removable strip to throw away, ensuring a cleaner experience. The inside tint and perforations along the flap reveal any tampering, enhancing security. Designed as No. 8-5/8 envelopes, they are compatible with most standard checks for payroll and accounts payable applications. Weighing 24 lb, they offer durability and reliability for your mailing needs.