What kind of paper is used for book printing?

Offset paper is generally used for book printing, also known as "Roadwood Paper". The surface is not coated with slurry, and its gloss and smoothness are worse than those of coated paper. Mainly for offset (offset) printing machines or other printing machines to print relatively high-level color prints, such as color pictorial inner pages, album inner pages, posters, advanced books, and book covers, inserts, etc.