QualityPark ONEVELOPE Self Mailer Check Envelope, Pack of 250 (35327) Print the payment details, check and address information on the inside of the ONEvelope. Heat resistant for use with laser printers used to produce checks. Check printing, inks, and paper conform to US banking standards. Long shelf life, hand sealable, all printing is done on one side. Seals permanently, single tape removal, security tinted.