With security tints and dependable adhesive, Quality Park Redi-Strip Security Envelopes are reliable as it gets for confidential mailing. Once priority documents are ready for shipping, be sure to preserve their integrity and condition inside the durable white wove paper. As you peel away the attachment and seal the envelopes closed, rest assured they'll be safe from prying eyes thanks to the security tint. Antimicrobial—Treated with an antimicrobial agent to protect the envelope from growth of bacteria, mold, mildew, fungus and odors. Seam Type: Center; Flap Type: Cheese Blade; Trade Size: #10 1/2; Security Tinted: Yes.