Decra. At 150 pounds per square, Decra stone-coated steel Shake XD panels are lighter than their composition and durability suggest. With the look of heavy cut rustic wood shakes, Shake XD panels are made of corrosion-resistant aluminumzinc alloy-coated steel with an acrylic bonded stonechip finish. The steel substrate is comprised of at least 25% post-consumer recycled steel. The panels will not crack, split, curl, or break, the maker says, and feature a 50-year limited warranty, 120-mph wind warranty, and are class 4 impact resistant, and class A firerated. 877.463.3272.