Bird Barrier's Bird-Coil is America's most innovative, versatile, easy-to-use anti-perching system. Made of high-grade stainless steel, Bird Coil is perfect for long, narrow, exposed ledges. It is also adaptable to most architectural details. Bird-Coil is almost invisible. When seen from a distance of twenty feet or more Bird Coil virtually disappears, and from fifty feet it's invisible.