Keeps Rats, Mice, Bats, Birds, Insects etc. . Out! ! -------------------------------------------------------------------------------- Copper Stuf-fit is a unique exclusion material that prevents pesky rodents from entering your home or office building. The Copper Stuf-fit is a copper mesh wool material that is rust-proof and stain-proof. Stuff it into openings around pipes or other holes and cracks in the structure and keep rats, mice, birds and other wildlife out. Because of the way the mesh is woven, it is very difficult for rodents to chew through it. Stuf-fit works best in holes and cracks around 2 inches in diameter. Larger holes should be repaired and sealed permanently. Each roll is 6 inches wide, double folded and 20 ft long. This is a copper mesh blend not 100% copper. I worked in wildlife control in Atlanta for years selling wildlife exclusions. . You know how much they charge? An average house was 600 to seal up. . Ya 600 to seal your house from rodents yikes! ! ! Worse part is. . They USE THIS SAME EXACT MESH in the same exact places around your home. . Sure up on roof line they use galvanized steel but even then they are only in their materials a dollar a foot if that and they charge 7 to 10 a foot. . yikes. . that's lots of labor. . Do it yourself and save lots of money. . If you have any questions how to do it just ask me and i will walk you through it. . . . email pestcontrolpross@hotmail if you need help =)