Crystal clear, heavy-duty 7 mil vinyl fits bks up to 8 3/16" high Slip-on bk covers with adjustable straps adjust easily to fit most bk widths Reusable, simply remove the cover and place on another bk Select exact height for soft cover bks; Add 1/4" to height for hardcover bks 10 covers per package Increase the life of soft or hard cover bks with these strong, slip-on reusable covers. 7-mil, crystal-clear, heavy-duty vinyl. Easy-to-use slip-on bk covers with adjustable straps require no tools or adhesives. Reusable time and time again; when it is time to dispose of a publication, just remove the cover and reuse it. Adjusts easily to fit most bk widths. Select exact height for soft cover bks; add 1/4" to height for hard cover bks. Step 1: Select the appropriate size. (Exact height for soft cover bks. Add 1/4" Height for hardcover bks.). Step 2: Slide front cover in provided sealed side pocket. Step 3: Wrap jacket lip over back cover and slide excess under the straps.