50 - 12x15.5 Fosmon Self-Seal Tear-Proof Polyethylene Mailers (50 Pack) 50x High Quality Self Sealing Poly Mailers Water, Tear and Puncture resistant mailers The silver inner layer provides you with confidentiality High strength adhesive provides a durable closure that's water and dirt resistant High-efficiency poly mailers are perfect for shipping a wide variety of non-fragile items.