Rite in the Rain Weatherproof Hard Cover Notebook, 4.75" x 7.5", Yellow Cover, Level Pattern (No. 310) WEATHERPROOF PAPER: 160 numbered pages / 80 sheets per notebook. This paper that wont turn to mush when wet and will repel water, sweat, grease, mud, and even survive the accidental laundry mishap and more. POLYDURA COVER: Polydura covers are a smooth 55 guage plastic material made with post-consumer waste. They're virtually indestructible. WHAT TO WRITE WITH: Use a Pencil or All-Weather Pen and your notes will stay intact. Standard Ballpoint pens will work when paper is dry. Water-based inks will bead off Rite in the Rain weatherproof sheets. ARCHIVAL PAPER: Rite in the Rain's archival-grade paper resists stains, survives moisture, and lasts a lifetime in storage. RECYCLABILITY: In spite of Rite in the Rain's durability, it is completely recyclable. Simply recycle Rite in the Rain as you do other white or printed papers.