These one-subject, wire-bound notebooks are perfect for science classes, doodles or just note-taking. Smooth, white, 15 lb. writing paper is ruled with 4 x 4 graph ruling with four squares per inch. Ends of tin spiral wire are coil-locked for snag-proof performance. Covers are printed on a bright board and come in four assorted colors: red, blue, black and green. Each 10-1/2" x 8" book contains 100 sheets of writing paper and is three-hole punched along the 10-1/2" binding edge so it can easily fit inside letter-size, three-ring binders. Sheets are not perforated.