Anti Pigeon Balcony: Compare with other plastic pigeon spikes, our anti pigeon spikes add small thorns between long thorns, effectively prevent birds such as pigeons and swallows from landing on beams, awnings or window sills and nest there and leave disgusting bird droppingsHigh quality and durable: The tip and base of the anti-pigeon spike are made of high quality plastic. It is not affected by extreme weather conditions such as rain, snow and high temperature, is resistant to ultraviolet rays and has a long service life.Easy Installation: There is a row of pre-drilled holes at the bottom of the anti-dove nails, which can be fixed with screws, or the anti-bird balcony can be fixed on the surface with cables or adhesive tape double sided for ease of movement. You can adjust the spacing of the bird netting as needed to prevent birds from roosting or nesting.Effective bird repellent: If you use anti-bird thorns, it can effectively prevent your balcony or gutter from being invaded by other windows, roofs, gutters and other birds. It can also be used as a cat balcony protection to scare your cat and prevent it from crossing.Package Contents: 10 pieces pigeon repellent, the pigeon nails are 30cm long, the plastic sharp nails are 3.6cm high. Each dove spike has 3 predetermined breaking points for flexible defense against pigeons and sparrows.