These Dark mailers are made of all paper materials. Delivers superior strength. Resistant protection. Effective way for shipping and mailing valuable items. The lightweight material provides cushioning while keeping envelope weight to a minimum for shipping expenses . Assure your goods from damage that can occur during transportation. Smart choice for all your shipping and packing needs. Constructed of sturdy Kraft Paper with a bubble protective inner envelope. An ideal option for mailing documents,books and much more. Excellent choice to protect your goods in transit. Dark mailers are ideal for shipping products for a high demand on the e-commerce industry. Created with high quality paper with built-in padding. Provided with an adhesive peel-n-seal strip for quick and safe closure. Mailer is a paper-based material that offers a particular mix of strength but being lightweight at the same time. Allowing safe transit and minimizing damage.