Cross Section Pad features quad ruling with five squares per inch for precise charting and other drawings. Both sides are printed with phantom, nonsmear ink that does not reproduce when photocopying. Glue-top construction allows easy sheet removal. Heavy blue lines highlight every inch with faint blue lines in between. Each 20 lb. letter-size sheet is acid-free and made of 20 lb. bond that will stand up to the toughest use. Sturdy back cover is made of 27 point material.