Impact-resistant Wire-O binding doesn’t get bent out of shape when tossed around in packs or your pocket. The Polydura cover creates a tough but flexible outer shell defending your notes from scratches and stains. Rulers, conversion charts, and map scales printed on the cover prove handy in the field. 50 sheets/100 pages of 20lb all-weather writing paper that sheds water. The Universal pattern provides the best of both worlds; standard horizontal lines plus faint vertical dashes for guidance with your sketches or diagrams.