You can repair books or make your own thermal covers using these thermal glue strips. These strips are cut to 5/8" wide and 10 1/2" long. They can be cut or combined to make the desired length or width. A thermal binding machine or similar heat source is required to use these strips. They can't be used by themselves without a backing or spine to glue pages into a u-shaped cover. They can be used in the same way to repair or replace pages in an existing book. If you want something to enable you to put together your own front and back cover and contents see our Unbind Steelbacks instead.____NOTE: Leave 1/4 " of the length of the book spine free of glue to avoid having it run onto your machine.