... 4)22 years of experience folder, paper file folder,ring binder,lever arch file,paper file holder,stationery 1) Size: ... process. 3) Materials: 157g art paper, duplex board with black back, copper plate, art paper, C1S mounted with each other. ... F/C,30*24.5*4.5cm2 paper material is 157g art paper and 1200g duplex grey cardboard and 157g ... needed,This folder is used for file holding,office,school etc.