MAILERS4U poly mailing envelopes are perfect for sending small items via FedEx, UPS, USPS, or DHL. The self-sealing adhesive makes packaging your items for shipment fast, easy, and secure. The durable 2.4 mil T poly material resists tearing and punctures. Mailers are grey in color and do not allow the contents to be seen through the mailer walls like some lighter colored mailers do. Each mailer is 19 in. x 24 in. not including the sealing tab. Overall mailer dimensions laying flat are 19.00 in. x 25.63 in. Includes 50 mailers.