Fu Global 4x8-Inch Poly Bubble Mailer Pink Self Seal Padded Envelopes Pack of 50 4x8 Inch pink poly bubble cushioned lined envelopes. Usable size: 4x7 inch Superior Barrier Bubble AIR CELLULAR cushioning layer Self-stick stamps and labels adhere easily and securely The self-seal closure provides a reliable, tamper-evident seal to secure all enclosures, while being opaque, the exterior film creates a crisp, professional image for your company. They provide the ultimate protection for your mailing. Extremely Flexible. The poly bubble mailers are unique, lightweight padded mailers made from a DURABLE,MOISTURE,MULTI-LAYER BLEND of polyethylene film. The film is laminated to a resilient, cushioning bubble material for added protection. Durable and moisture-resistant, with exceptional puncture resistance, tear strength, and cushioning performance.