You just need a piece of paper, cut it to the right size, and decorate it with colored pens or seals.
2, plastic bookmarks
Cut the transparent plastic bag to a suitable size and decorate it with colored pens or seals.
3, leather bookmarks
Just cut a piece of leather to the right size and decorate it with colored pens or seals.
4. Magnetic bookmarks
Just cut the magnet and a piece of paper to the right size, and then decorate it with colored pens or seals.