"DuraRite" is a "synthetic" paper created for use in extreme conditions. It is actually waterproof and can even be used under water. "DuraRIte" Level notebook is printed with 6 columns on the both sides of each sheet. A tough polyethylene cover binds 32 sheets (64 pages). Shipping weight for single book is 12 ounces; 12 books weigh 5 lbs. (Manufacturer's number 613.) Please note the price shown is per book