What kinds of paper use for inner pages of notebook?

From the binding, most paper cover notebooks use spiral binding, saddle sketch and sewing, like the binding of exercise books uses saddle stitching and sewing as their inner paper no exceed 48 pages. Exceeding 48 pages, it usually used a single spiral. From the thickness of the cover material, there is a cardboard notebook and a hardcover notebook. Cardboard notebook, cover material usually uses 350g--500g C1S and kraft paper or other special paper. And Hardcover notebooks usually use 157g C2S + greyboard and the binding is usually double spiral named Wire-O which is one of the most popular binding ways in notebook series like journals, diaries, note pads.

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