Jiffy Padded Self Seal Mailers (#1, 7-1/4-Inch x 12-Inch, Case of 100) The mailer's macerated paper padding expands during use, providing protection throughout shipping cycle. A smooth inner liner and pre-scored flap provide easy product insertion and efficient closure. Convenient tear tape allows for quick and easy opening. Contains 100% recycled paper fibers, and can be recycled with mixed paper products. This product is SFI Certified.