The UniCover Spine is a thermal binding spine which is a way to bind your documents with your own cover set or one of Unibind's many custom CoverSets. UniCover Spines are available in eight different colors. Each UniCover spine has a perforated sheet which is a guide to help fit all your contents into the binding spine. Using Unibind binding spines is a breeze; after your document is complete, tear away the paper sheet for a beautiful presentation. These UniCover spines are dark green color.