100% Stainless Steel. 24 gauge hood and base with built-in screening. 8" screen height 3/4" mesh is standard. Superior animal-proof diamond hole mesh prevents creosote build-up. A uniquely designed, the sturdy base will not bow when tightening to the flue tile. Machine threaded technology prevents bolts from stripping. You won't find a higher quality chimney cap at a lower price anywhere! Will fit flue sizes from 7" x 7" to 9" x 9". Made in the USA. Lifetime Warranty.