Durable Construction: These poly mailers are made from sturdy, waterproof polyethylene material to protect your shipments from moisture and damage.Color: Outer gray, inner black。 Multipurpose Usage: Ideal for shipping clothes, documents, small items, and more. These versatile bags can be used for a variety of mailing needs. Secure Seal: The self-sealing adhesive strip ensures a tight closure, keeping contents secure during transit. Convenient Size: Measuring 6x9 inches, these poly mailers accommodate a range of package sizes for efficient shipping.