POLY BUBBLE MAILERS: This pack contains 50 light weight bubble cushioned poly mailer envelopes DURABLE: These poly bubble mailers are made out of polypropylene material, 3/16″ bubble cushioning wraps to help keep objects safe in shipping. They are 100% light weight and ad no cost to your shipping destination. SELF-ADHERING: Peel-and-seal strip is quick and easy to use. Once sealed, it cannot be reopened without visible tampering signs. Puncture, tamper, and water-resistant for added security during shipment. DIMENSIONS: Outside size: 8.5 x 14.5 in, usable size: 8.5 x 12 in SHOP FOR MORE: Visit our brand store for a wide selection of high-quality shipping solutions and other premium products to meet all your mailing needs.