"DuraRite" is a "synthetic" paper created for use in extreme conditions. It is actually waterproof and can even be used under water. "DuraRIte" Metric Field is notebook printed with 6 columns on one side and a 5mm grid on the other sheet.  Polyethelene cover binds 32 sheets (64 pages).   Shipping weight for a single book is 12 ounces;  12 books weight 5 lbs.   (Manufacturer's number 663)  Please note price shown is per book.