These Mylar Bookmarks are fast and easy ?In the Hoop? Projects, which means no additional sewing! Mylar is a very shiny plastic material that you will immediately recognize from balloons you?ve purchased at party stores. You can order Mylar online in a huge assortment of colors. You can also use regular cotton fabric instead of Mylar is you choose. With 20 designs to choose from, these bookmarks make great gifts!