Reading Guide products are designed to aid students and adults with the following difficulties: skipping words, skipping lines, reversing letters, transposing letters, losing your place, re-reading lines, squinting, concentration, comprehension, red/watery eyes and reading fatigue. Easily track print through transparent tinted window. Each big guide measures 3-3/4" x 7-1/4". Sold as a pack of 12 reading guides.