A guide to use while writing on blank paper! When placed under the a blank page, the lines show through. Double-sided: one side features heavy black lines spaced 1/2" apart; the other side has thick black lines spaced 11/16" apart, with a thinner dashed line in the middle for ascender and descender placement. Printed on heavy cardstock. Measures 6-3/8 x 8-1/4". One per package.