JAM Paper's commercial window envelopes are the perfect envelope option for businesses and individuals who need their mail displayed upon arrival. With a large window opening your recipients are guaranteed to catch a glimpse of content without completely opening! These 9" x 12" white envelopes are popularly used for sending headshots, prom pictures, certificates, invoices, statements and more!Details:White9" x 12"25 envelopes24lb. paperSmooth finishStraight flapGum adhesive closure