Size #0 6 x 10 ~ 50, 100, 200, 300, 400, 500 POLY Bubble Cushion Self-Seal Padded Envelope Mailers ~ AirPrime DESIGNED IN USA: Poly Bubble Mailer. Outside Size: 6" x 10" Usable Size: 5.25" x 9", 50-pack box LIGHT WEIGHT CUSHION MAILERS: The padded envelopes are very light, it can provide outstanding low cost shipping protection for a wide range of products. DURABLE: The surface of the bubble envelopes are made from a durable, polyethylene stretchable material that will ensure protection during transit. The interior is built with a bubble lined wall construction for extra protection during transit, ensuring the packages arrive in excellent condition. TIGHT SEAL: The self-seal closure provides a reliable, tamper-evident tight seal to secure all enclosures. Extra smooth surface is perfect for handwriting, labeling and stamping. SHIPPERS APPROVED: Approved to use with major carriers - USPS, UPS, FedEx, DHL and more.