What is this? Our bubble padded mailers are made from polyethylene and paper, moisture resistant, tear strength. They are very suitable for the distribution and logistics of documents, cosmetics, jewelry, small items and other small accessories, providing good anti-extrusion protection. What will I get? Size: 11x13cm/4.33"x5.12"; 11x15cm/4.33"x5.91" 12x18cm/4.72"x7.09" 13x15cm/5.12"x5.91" 14x16cm/5.51"x6.3" 15x18cm/5.91"x7.09" 15x20cm/5.91"x7.87" 15x25cm/5.91"x9.84" 16x20cm/6.3"x7.87" 18x16cm/7.09"x6.3" 18x20cm/7.09"x7.87" 18x23cm/7.09"x9.06" 19x28cm/7.48"x11.02" 20x25cm/7.87"x9.84" 20x30cm/7.87"x11.81" Thickness: 5mm/0.2 inch Extended Seal Length: 4cm/0.16 inch Package Content: 25pcs/50pcs x Padded Bubble Envelopes Are there any advantages of the product? The bubble envelope is lightweight and does not increase transportation costs. The yellow envelope is completely opaque, great privacy protection. The interior is of a bubble-lined wall structure, which provides additional protection during transportation to ensure that the package is intact. How to use it? Put your item into the envelope bag, then peel off the protective strip, press down to seal the envelope. These mailing envelopes can be used in the office, shop and any place that needs to be shipped. It is easy to write and note on the envelope's smooth surface. What should I notice? Please check the size of the padded envelope before ordering.