This durable, conformable, crystal clear tape is for repairing, reinforcing, and protecting the bound edges and surfaces of books, magazines, and other printed documents. 3M Scotch #845 Book Tape is also good for hinging and laminating. This tape has a very strong bond and will not crack or dry out. Acid free. 15 yard roll on a 3" core (approximately 14 meters on an 8 cm core).