1) Paper board is good break resistance . 2)Made from the top grade wood pulp /recycle pulp. 3)Thickness:1.0mm~5.0mm. 4)Size:can be product s you need.Standard size 787*1092 or 889*1194 5)Color:fully grey ,grey core,grey face,grey back 6)ApplicationsBook covers,lever arch files,Ringbinders,Files,Albums,Diaries,Game boards,Displays,Showcards,Puzzle and game boxes,Luxury packaging 7)Past ISO9001: ...