Strong, tamper-evident seal safeguards confidential documents. Small perforations along the flaps provide evidence of tampering. Security tinted with a shelf-life six times longer than standard latex adhesive envelopes. Envelope Size: 3 5/8 x 8 5/8; Envelope/Mailer Type: Tax and Business Form; Closure: Self-Adhesive; Trade Size: #8 5/8.