QUANTITY: 300 PCSSIZE: 10 INCH X 13 INCHSecure Seal™ Poly MailersStrong polyethylene mailers protect products from moisture during shipping.Mailers are puncture, water, tamper, and tear resistant.All sizes are interior dimensionsHigh strength seams will keep contents intact, even if over packed.The outer surface of the mailer is white and the inner lining is silver.Labels, stamps, and ink adhere well.Self-sealing.