Mr. Sticky Fly Trapping System"Non Polluting non toxic Sticky Roll is a reel to reel system of sticky tape that really catches flies! When flies first hatch after feeding or when the weather cools they tend to congregate overhead where they are caught on the roll. Once entrapped they produce stress chemicals which are irresistible attractants to other flies. Eventually the tape is completely black with trapped flies. Sticky Roll is a safe and effective system that is easy to