The Weathershield Copper Cap uses copper for exceptional beauty and austenitic stainless steel for strength. Owners of homes in historic areas, or those with a higher sense of aesthetic values, may prefer the look of copper over traditional stainless steel. The Copper Vacu-Stack models are an excellent choice in these situations, and offer all of the benefits of the original stainless steel models. Each cap is built with sturdy austenitic stainless steel construction surrounded by a lustrous copper hood. The Weathershield Copper Chimney Cap helps maintain a chimney's optimum performance by keeping out rain, snow, leaves, debris, squirrels, birds and other animals. An added feature is the removable mesh screen that provides a measure of safety by helping to contain sparks. It also has a 100% stainless steel and copper construction that assures long life and performance. This model is designed for round, non air cooled chimneys, has a 1" x 1" stainless steel screen mesh and works with the following types of chimneys: Single Wall, Masonry, Solid Pack Insulated, Class A, and B vent.