8 Security Envelope: No.8 Envelopes are suitable for secure business mail, bills, checks and other business correspondence. Security Tint Design: The security print inside keeps contents private and prevents snooping. Double Window: Dual window design allows easy reading of contents and eliminates handwritten or typed addresses. Peel and Self Seal: Pull-off strip closure makes processing quicker with no licking or wet sponge needed. Five Hundred Count: 500 envelopes per box with separate 100-count labels for easy tracking. Weight: 5.5 pounds