Wire-O Binding Impact-resistant Wire-O doesn&';t get bent out of shape when tossed around in packs or your pocket. Polydura Cover The Polydura cover creates a tough but flexible outer shell defending your notes from scratches and stains. Rulers & Reference Rulers, conversion charts, and map scales printed on the cover prove handy in the field. COVERMATERIAL: Polydura, 23 gauge Reference: Imperial & metric rulers, conversion table, map scale BINDING STYLE: Wire-O PROPERTIES: Rust-resistant FINISH: Rounded Corners ALL-WEATHER PAPER SHEET SIZE: 4" x 6" PAGES: 100 pages / 50 sheetsPERFORATED: No SINGLE UNIT SIZE: 4" x 6.25" x .375" WEIGHT: .2 lbs MANUFACTURED: U.S.A.