Send confidential materials with confidence with this mailer featuring sealing tape which reveals the word "void" if tampered with. Tamper-indicating seals on three sides of envelope for extra security. Bubble-lining protects contents from damage. Security tint obscures contents from inspection. Envelope Size: 9 x 12; Envelope/Mailer Type: Catalog/Clasp; Closure: Dual Redi-Stripô.