Anti Pigeon Spike: Compare with other plastic anti pigeon spikes, our anti pigeon spikes add small thorns between the long thorns, effectively prevent birds such as pigeons and sparrows from landing on beams, awnings or window sills and nesting there and leaving disgusting bird droppings! Anti Pigeons for Balcony: 3-row anti pigeon spike provide effective protection against birds installed on the roof, balconies, gutters or railings. Bird repellent can also be used as a cat repellent to scare your cat and prevent it from crossing the balcony. High Quality Anti Pigeon Spike: The pigeon repellents are made of high-strength polypropylene plastic, not afraid of UV and frost, waterproof, not easy to rust like metal and not deformed under strong sunlight. can be used for a long time. Easy Installation: Cat repellent can be easily assembled, e.g. with glue, dowels or cable ties. Depending on the type of area or your own needs.