Single window security tinted envelope with Reveal-N-Seal® self seal closure is the ultimate in convenience and security. Self seal closure alleviates the need to moisten flaps and to throw away pull-off strips. Simply fold bottom flap up and press for a secure seal! Window conveniently accommodates the printed address eliminating hand addressing. Interior Blue-Pattern Security Tint. Seam Type: Diagonal; Flap Type: Commercial; Trade Size: #10; Security Tinted: Yes.