Mailer Envelopes, Material Paper, Mailer Type Bubble, Closure Style Self Sealing, Color Kraft, Usable WxL 14 in x 19 in, Usable Width 14 in, Usable Length 19 in, Outside WxL 14 1/4 in x 20 in, Outside Width 20 in, Outside Length 14 1/4 in, Mailer Number #7, Bubble Size 3/16 in, Material Thickness 0.25 in, With Tear Strip No, Pre-Printed Address Lines No, Package Quantity 50 Paper bubble mailers cost less than poly bubble mailers and are constructed of a paper envelope with a bubble liner. The self-sealing closure secures the contents in the envelope for shipment, and the liner provides cushioning to protect the item from damage.Bubble mailers have a plastic bubble liner to provide some cushioning and padding around items. These mailing envelopes protect the contents of the package and help.