Send letters, invoices, and other important documents with these Redi-Strip envelopes. The blue-tint pattern keeps documents hidden from view, while the white exteriors offer a blank background for postage and address labels. Redi-Strip closures provide a secure seal, preventing papers from getting lost. Featuring 24-pound stock, these Quality Park #10 security-tinted envelopes stand up to the rigors of the mailing process.