Mead #8 6-3/4 Security Envelopes 6 1/2 x 3 5/8 Inch, 80 Count/Box Regular letter size not large business size envelopes. Traditional gummed-adhesive V-flap closure. Security-tinted business-weight paper. Tastefully attractive smooth finish. Keep prying eyes off your important documents and checks with this security envelope that has a security tint. The printed lining for privacy is ideal for sending confidential mail. Diagonal flap is fully gummed for secure seal. Specifications Envelope Size: 3 5/8" x 6 1/2" Security (Printed Lining for Privacy) Closure: Gummed V-Flap Color: White Model: 75355 UPC: 043100753551 USA domestic shipments are shipped USPS First Class Mail with Tracking International shipments are shipped USPS First Class International Mail with Tracking Review: These are my go to everyday envelopes. When I use these envelopes, I don't have to worry about protecting checks and other important documents. They are made in a way that you can't see what is inside. I know mail tampering is illegal but there are scam artists out there.