The I'am not perfect bookmark with elastic band is a must-have for all bookworms.This line of bookmarks comes with a handy elastic to hold you bookmark in place no matter how you carry your books. This line of bookmarks comes with a handy elastic to hold you bookmark in place no matter how you carry your books. Bookmark is 17.5cm x 4.7cm, with a 32cm loop of elastic to secure your book.