... . outstanding credibility duplex board with white back papersubs: 250g/280g/300g/350g/400g/450g/500g quality: AAA grade, AA grade, A grade and B gradeQuality Introduction ... , toy, drug, appliance filed and others.Advantage: strong stiffness and folding resistance, good printing ink absorbency and further processed, with reliable and steadily quality. Duplex board with white back paper