This California Steel Chimney Cap by Symple Stuff Company is a durable and economic choice for chimneys in most regions. The adjustability simplifies the difficult job of measuring and installing a chimney cap. Like all Symple Stuff chimney covers, the mounting design provides maximum free air space and a better draft while the attractive powder coat finish helps it stand up to the elements. Made with a 24 gauge galvanized steel hood with scalloped corners and roll-formed edges and 18 gauge 5/8" expanded galvanized steel mesh.