"DuraRite" is a "synthetic" paper created for use in extreme conditions. It is actually waterproof and can even be used under water. "DuraRIte" 3" x 5"  top opening Pocket Notebook is printed with Universal on one page and 1/4 Rules with faint 1/4" Grid on the other sheet. A tough polyethylene cover binds 50 sheets (100 pages). Shipping weight for single book is 10 ounces; 12 books weigh 3 lbs. (Manufacturer's number 635.) Please note the price shown is per book.