This is a laser compatible Self Mailer form 8½"x11" in size. The USPS 3800 Certified Mail® label is incorporated into this form. The form duplex prints. There are no matching parts to assemble and keep track of. This insures 100% quality mailpiece integrity. Generic information can be preprinted or you can laser image all data. This Self Mailer is automation compatible, great for both high volume uses as well as low volume office environments.