... surface 4.Past ISO9001-2008,FSC,SGS,SDS test Grey paper board,grey chipboard1.top grade wood pulp/recycle pulp2.good stiffness3 ... with Black card , white card , kraft paper and many other kinds of paper .E.Grey board color black , white,black and any other ... Grey Back .G.Both-side smooth grey board. Usagepaper Packaging box Notebook cover Hardcover Hangtag,paper card Poster board Ablum jigsaw and etc.