Opaque Poly Bubble Mailers: The black bubble mailers outer size is 4x8 inch, while the inner size is 4x7 inch. With full air bubbles, our bubble mailers can protect your value products from damage caused by external impacts. The inner lining is using gray film, even if there is strong light, the items in the bag cannot be seen, which can protect your privacy well | Strong Self Sealing Adhesive: Our padded envelopes is using four-season adhesive, which can maintain strong stickiness throughout the year, even if the weather is very hot or cold. The strong stickiness prevents your items from being secretly replaced during transportation. The adhesive is covered with silver strip, which are easily peel off the strip and seal the bag | Sturdy and Durable Construction: The thicken shipping bags covers with polyethylene material, making them not easily punctured and damaged. Beside, the shipping bags features with excellent waterproof and tearing proof effects because of the reinforce sealing on the edge. They can keep your value stuff safely to destination even though using on foggy or rainy days | Convenient and Easy to Use: These poly shipping bags are the perfect choice for small and middle business for easily using with not require extra packaging material, which can improve your company productivity at work, save much time. It is very suitable to transport for cards, coin, jewelry, makeup supplies and more | Enhance Brand Influence: Bright colors bring a lively atmosphere, which makes the items you transport more conspicuous and will not be easily lost. Beautiful colors can also make your customers happy and enhance your brand influence. We have been committed to making better products to serve our customers, so that their business can get better and better