Size: 10 x 13 Catalog
Often used for thicker mailings of 8.5 x 11 or mailings of 9 x 12 folders.
Weight: 1.6 mil BOPP
A plastic film, specifically "Biaxially Oriented Polypropylene" film, has excellent sealing, stiffness and transparency. It is 1.6 thousands of an inch thick.