iMBAPrice (1000-Pack) Poly Mailers 14.5x19 Inch ML Size White Color Poly Mailing Shipping Envelopes Bags, Self Seal Adhesive Waterproof and Tear Proof are a type of packaging product commonly used for shipping items. These mailers are made of white polyethylene material, which is a lightweight and durable plastic. They are designed to protect the contents from moisture and tampering during transit. These light weight poly mailers self seal for easy and secure packing. Each Poly Mailer is 14.5x 19" in size and is white with black privacy lining, providing a professional and private appearance. It's essential to ensure that the size of the mailer is appropriate for the items you intend to ship. You can use these mailers for personal or business shipping needs, depending on your requirements.