300 Pieces of 24x19'' High Quality 2.35MIL Poly Mailers with Privacy ShieldThese are not the typical 1.5 to 1.9MIL polymailers that you find everywhere online. Our mailers are 2.35MIL, which allows them to handle a lot more abuse, fit larger items, and easier to package. Bags are Privacy Shielded Our bags are privacy shielded with a thick outer layer and a black inside layer. You can ship confidentially with our mailers.Water-proof, Strong Self-Adhesive, and Tear & Tamper ProofYou can rest easy at night knowing that your envelope will not break in route to your customers. Our seal cannot be undone without destroying the package, which is great for anyone looking to snoop into your mail.