Wall 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 flexible for curved or uneven surfaces. There is a snap off break point, Our wall / fence spike strips have pre-drilled holes in the base; simply attach the bird spikes to the desired fence and boundary with screws or cable ties. Saving you time and effort while providing maximum protection. EFFECTIVE DETERRENT AGAINST BIRDS: Simple and effective deterrent against birds, cats and burglars. The spikes are easy to fix to fence tops using screws, nails of silicone or tie wraps.