Double-sided black cardboard through the heart, there are two categories. One is the side coated, wood pulp environmentally neutral black cardboard, one is coated on both sides. Some businesses also said that a single light and double light. But in fact the meaning is the same. Is one side smooth, one side through the heart of black cardboard, one side is not so smooth single blackened card. Very smooth on both sides is double blacked card. The reason why there is such a distinction. Because some businesses will use the black card do handbags, bags and the like. As this is only one side demanding products, Houjie black cardboard, single-blackened card is the most affordable. Product Name black cardboard, green black cardboard, black cardboard through the heart, through the heart of black cardboard sided, double-sided black cardboard Product Weight 110g, 120g, 150g, 180g, 200g, 250g, 300g, 350g, 400g , 450g, 500g product specifications reel, paperback Chia degree Features green dye, pollution, paper color stability, the middle part of the color is black sandwich materials sub-US scrap wood pulp, high stiffness, perfect smoothness and flatness, Rally strong product uses mainly for frame backplane, album, high-end gift boxes, high-end jewelry boxes, high-end phone boxes, clothing tag shoebox stationery, notebooks, calendars, hand bags and horn speaker pads as well as the whole wood crafts Package environmentally neutral black cardboard, Houjie black cardboard, Paper Nobuhiro million provided by the Dongguan City billion letter macro Paper Limited. Dongguan City billion Nobuhiro Paper Co., Ltd. (www.yixinhong.com) strong, credible, a jam in Dongguan, Guangdong and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead billion letters macro paper and you hand in hand into the brilliant, for a better future!