Do you have to add book slots to book covers

Yes. Book grooves are the two grooves pressed into the spine joints of the front and back covers of a hardcover book after it is closed. Book cover to add book grooves, book cover outside the wrapping paper. Printed with the name of the book, the author, the publisher's name and decorative drawings, the role of two: one is to protect the book is not easy to be damaged; the second is that you can decorate the book to improve its grade.