Weatherproof Paper: Will not turn to mush when wet. Wire-O Binding: Tough impact-resistant Wire-O binding won't lose its shape in your back pocket or backpack. Cover Protection: PVC material creates a tough but flexible outer shell, and will repel sweat, grease and mud. Recyclability : Our notebooks are non-polluting, please recycle them just as any other white or printed papers. Five items, each one is 48 sheets, 98 pages.