Marine Annual Qualification DatabookPolydura cover Imperial & metric rulers Sheet size: 4. 625'' x 7'' Impact resistant Wire O binding doesn*t get bent out of shape when tossed around in your pack or uniform pocket. The Polydura cover material creates a tough but flexible outer shell defending your notes from stains and scuffing. Detailed diagrams review weapons handling and marksmanship. Data pages log results of your shooting sessions.