@kristinworker6356 hi the paper isn't as thick as books like the beauty of horror or johanna basford books, it's the same as other books published by LomArt like luna colouring, manga art, goddess colouring books so the paper is fine for using pencils as shown in my videos colouring in those books. The designs are printed one sided so if using pens put some sheets of paper underneath the page as pens especially alcohol markers would go through to mark the other side, but theres no design directly on the back to ruin but sheets of paper will stop ink going on the next page 😊