"DuraRite" is a "synthetic" paper created for use in extreme conditions. It is actually waterproof and can even be used under water. "DuraRite" loose leaf sheet is hole punched (round holes will only fit the Rite in the Rain binders), and printed with 6 columns on both sides. 100 sheets per package. Shipping weight for 1 package is 12 ounces; for 5 packages (500 sheets) weighs 4 lbs. (Manufacturer's number 612.)  100 loose leaf sheets per package. Quantity discounts shown in the selection box.