HomeSaver Pro single-flue chimney cap are made of 100% 304-Alloy stainless steel, right down to its pointed, slotted, hex-head set-screws.  The chimney cap is durable, and will never rust, and there are many sizes to fit the size of your chimney flue. The all stainless steel HomeSaver Pro single-flue chimney cap come to you with a lifetime warranty against rust and workmanship defects, regardless of any type of fuel being used.