Bird Spikes are used to prevent large birds from landing on flat or curved surfaces Birds cannot land on the un-even surface created by the spikes and will move on to a better spot Polycarbonate spikes are an effective, humane solution for deterring birds from unwanted areas These spikes are easy to install and maintenance free, you can simply attach base to surface with adhesive, nails, wire or screws and eliminate pest problems permanently Flexible base will mount on curved or straight surfaces