📬 Seal the Deal with Confidence! Security tinted interior keeps contents hidden. Jumbo box of 500 for all your mailing needs. Release & Seal peel strip for a clean close. Patented SimplySafe seal shows tampering. Double windows for clear sender & receiver display. 500 count Tamper-evident Double window The Columbian #8 5/8 Security Envelopes come in a bulk pack of 500, featuring a patented SimplySafe tamper-evident seal, security tinted interior, and a user-friendly Release & Seal closure. Designed for privacy and ease of use, these envelopes are perfect for securely mailing sensitive documents.