It is a contact paper. Ideal for covering books,arts,crafts,furniture and many smooth surfaces. CRYSTAL CLEAR BOOK COVERS will protect your books from greasy fingers, dust, pen marks, dirt, and grime. This lightweight barrier is best used in a setting when books are exposed to light wear, such as a book signing, personal collection, or gallery environments HIGH QUALITY COVER PROTECTION means that these plastic book covers are engineered with 2.0 mil polypropylene rather than dense vinyl, so you get high quality protection at an affordable cost. The material is thin and lightweight, yet designed to not easily rip, tear, split, break, or rupture