Columbian #9 Double Window Envelopes with a SimplySafe security seal are ideal for mailing important documents or sending sensitive client information. Each security tinted envelope has a scrambled blue pattern printed on the interior that conceals the contents. The patented SimplySafe seal is constructed to show any signs of tampering. These business envelopes are still easy for the sender to close and the intended recipient to open. The Release & Seal strip peels right off so you can press to seal without any moisture. A pull strip makes opening the envelope straightforward and prevents you from tearing the documents inside. These #9 self seal envelopes are inkjet printer compatible, though not recommended for a laser printer (use address labels instead). Stock up on number 9 security envelopes for billing paperwork, tax documents, accounting records and more. Double window envelopes show sender and receiver addresses; top window is 7/8" x 3 1/2"; 3/8" from the left; 2" from the bottom; bottom window is 1" x 4"; 3/8" from the left; 1/2" from the bottom. Overall envelope dimensions are 3-7/8 x 8-7/8 inches. White. Box of 500.