... PP cover: 0.45mm,inner pocket: 0.15mm 2.letter size 3.12insert tabs,13 pocket 4.24pcs/ctn Type: Expanding file ... R&D, manufacture and selling of PP series office stationary. The product range includes, file folders, expanding files, clip files, document bags ... , document cases, clear books, card cases, pencil cases, pp tab dividers, ...