Self Seal Envelopes: Go away with licking yucky glue! Peel, Press & Self Seal. Easy and time-saving. No paper cuts on your tongue and no need moisture. Double Window Business Envelopes help save more efforts and time from labeling or addressing. Highly reduce work load and mistakes. Improve efficency Made of durable White kraft paper, #10 envelopes provide high quality smooth surface finish and super secure privacy for labeling or addressing. Large quantities supply is cheap for frequent mailings, business documents or big bulk mailing projects. Absolute 500 COUNTS. #10 Bussiness Envelopes perfect for mailing business materials, letters, Checks, Cheques. Acko #10 Double Window Security Business Mailing Envelopes ☑This is the standard #10 envelope with double window, it can show the basic information of the invoice, statements or documents, can easily display postal addresses. ☑Acko's envelopes outside is white, inside is blue, this is security tint protects your personal information as well as your customer's, this is very important for your business. ☑In the modern world of business, too many people have forgotten the value of an old-fashioned letter. If you are the one who use the modern methods and also use the old-fashioned method contact with your customers, maybe you can get more business chance than your competitors. ☑Simply by reaching your customers through the mail, you are instantly placing yourself in their homes, providing a physical reminder of your products and services. A letter is much harder to ignore than an email.