Jiffy Rigi Bag Mailers (#4, 9-3/8-Inch x 12-7/8-Inch, Case of 200) Laminated fiberboard construction prevents movement of contents and resists bending, folding and creasing. High strength self-seal provides fast and secure 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.