Contains 1 Box of 500 Check Envelopes Designed for QuickBooks Checks Self Seal Adhesive Back Double Window Front Easy to Open Close Use these classy security check envelopes to send payments securely and quickly. No more licking envelopes, these self seal envelopes contain a fold down flap that reveals a non-sticky adhesive to close the envelope securely. The high security design of these envelopes make it impossible to read the contents within, protecting your financial data from ID theft. Contains one box of 500 envelopes.