Color:matt black Light Weight Mailers: Useful Space: 5x7.87 inches, pack of 50 lined mailers. Zhitong poly bubble mailers are with fashionable design, stands out of the crowd in the mailer world. And those padded mailers are lightwight mailing envelops, will not add to your shipping costs. Self-Adhering Envelopes: The Zhitong poly bubble mailers come with a self-adhesive tamper proof seal. They provides a reliable, tamper-evident tight seal to secure all enclosures. It cannot be opened without visible signs of tampering. CAUTION: sticky closure should be adhered in 1 minute. Waterproof Envelopes: Zhitong Padded Bubble Envelopes are laminated to make them completely waterproof and resistant to puncture or tears. When you use a Zhitong Bubble Mailer, the bubble layer provides added cushioning , outstanding storage and shipping protection to protect the shipment.