The pigeon repellent is made of highly durable stainless steel spikes and polypropylene construction for long life. Withstands temperatures from -40°C to +60°C. Cat Defenders humanely prevent pigeons and birds from landing, staying, playing, nesting or roosting on your windowsills, fences, roofs and decks. Flexible anti-pigeon wire base for mounting on curved and uneven surfaces and can be easily installed using adhesive, nails, screws or zip ties. An effective, safe, permanent and bird-safe solution. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.