Physical barriers are the most effective way to keep birds off. Wherever applied, physical barriers eliminate the ability to land and perch. Plastic Spikes install easily with special spike adhesive, nails, screws or ties. Prevent birds from landing anywhere! Provides 100% protection on rooftops, ledges, fences and more! Bird-X's plastic bird spikes are made of a durable polycarbonate material that won't corrode or decay. Plastic Bird Spikes require zero maintenance and provide total pest bird protection while maintaining facility aesthetics.