Wall & Fence Spikes - Security Spikes, Stop Climbing Over Walls and Fences, Ideal for Keeping Pigeons, Birds, Squirrels, Cats Away, Suitable for Fences, Balcony, Roofs - MultiPack 8X12Wall and Fence Spikes Made with Durable polypropylene material. High Spikes, Great for Deterrent and Repellent: ideal for fences, walls, and window sills. Good deterrent for intruders and all types of pests such as Cats, foxes and large birds. Highly Durable and Long Lasting Material: created from high strength polypropylene material and our roof security bird cat plastic spike is durable and hard to break. SIMPLE TO INSTALL: The spike strips are