2.5 MIL Self Sealing Poly Courier Shipping Mailers!Pressure sensitive adhesive provides a high strength durable closure, water and dirt resistantSuperior tear and puncture resistance.The PRIVACY inner layer provides confidentiality 2000 (6" x 9") + 100 9"x 12" Self Sealing Poly Mailers (Just Peel-and-Seal) Track Page Views WithAuctiva's Counter