Package - Total of 20 bird spikes in total. Each bird spike measures 11 x 2.1 x 1.4 inches and can be used to cover nearly 35 feet; each deterrent has 4 flexible, detachable sections to meet your different use needs. Upgrade Bird Spikes - Replace barbed wire with pigeon deterrent, keeping raccoons, squirrels, birds, and other animals away without causing harm to animals/humans. Easy Installation - Each bird nail has several screw holes, which can be fixed with nails, glue, or cable ties to install them on fences, roofs, patios, etc. Material - Made of high-quality ABS, the anti-bird nails will not rust, are not easy to corrode, can be used for a long time, and protect the environment.