Stops bird infestations. Durable. Use on buildings and structures to eliminate the roosting and nesting surface of birds. Spikes are not lethal, just irritating, intimidating and uninviting. Lightweight. Provides a low profile method for keeping birds offyour property. Flexible base so spikes can be installed on curved surfaces using nail, glue or tie. Blends with surroundings. Maintenance free; won't corrode or decay. Also stops climbing animals. 4.3 -inch H x 1 -inch W base.