More chimney's are damaged from lack of a chimney cap than any other cause. Here's a great cap to add to your arsenal to prevent chimney damage. It's named the "Forever Cap" and for good reason. Constructed of 304 stainless steel, the Chim Cap Forever Cap is known for its sturdy, two-piece design which consists of a 24-ga. lid and an 18-ga., one-piece screen/base with 8" high mesh. Even the most determined critter will have difficulty getting through the unique Chim Cap 3/4" oval hole mesh.