Scotch 040581 Acid-Free Pressure Sensitive Self-Adhesive Book Tape With 3 In. Core, 4 In. x 15 Yd, Crystal Clear 3.5-mil polypropylene, 45 lb. tensile strength Crystal-clear tape with a gloss finish Conforms permanently to book contour; will not crack or dry out Can be written on with permanent marker Non-yellowing and tear resistant, 3" core