Notebooks Notebooks with Pen Holder and Ring Binder Refills, Made of Eco-friendly Material NotebooksCover: PU, sponge and paperboard Inner page: 2 sheets, 250gsm gray cardboard 100 sheets 80gsm offset paper With 1C printing Binding: ring binder Size: A4, A5 and A6 Please feel free to contact me if you need more information.