1, the new advanced elastic cover back loose leaf book, the back side can be pressed by hand, hand pinch, its corner anti-collision, multiple superimposed into the bag is not afraid of crushing. 2. Compared with similar products, it is a "lightweight" and "large-capacity" loose-leaf book, and its back and back plate design are inspired by the structure of "ancient Chinese bamboo books". 3, it can support the strength of the whole binder, elastic side back can be pinched, anti-collision corners, reduce the thickness of the binder, hand-held does not collapse, and can curl oh! Great design! 4, cover PP environmental protection plastic quality material, cover thickness is strictly measured 0.58mm thickness, different from other loose leaf cover 0.7mm too thick, 0.45 too thin, hold feel very good! 5, the curved surface design adopts a new process, its PP cover does not warp edge, the cover will not warp edge after opening, completely flat the desktop, and does not touch the design, the user experience is recognized, so that the good-looking loose-leaf book is easy to use, so that the good loose-leaf book is more practical!