The cover is made of smooth and translucent polypropylene. It ensures a flexible and robust notebook that will resist scratches, splashes, and tears. The double spiral binding (also known as integral binding) is sturdy and allows the notebook to open 360°, for maximum flexibility and comfort during use. The Seyès large grid ruling, in 2 colors, ensures better readability. It helps reduce the effect of visual fatigue while effectively improving concentration. This product is available in the following color versions: assorted: red, green, yellow, blue.