Defender Plastic Bird Spikes Kit | 50 Feet with Glue | Pigeon Control Guide | Various Size Kits Defender Bird Spikes stop pigeons & birds landing, perching or roosting on ledges up to 4 inches wide 50 Feet Kit includes - 45 individual bird deterrent strips & 1 Defender Silicone Glue Includes 40 page Defender pigeon deterrent guide & Defender 15 year warranty certificate Each pigeon repellent strip is snappable to size | Glue, screw or zip tie down UV Polycarbonate anti-roosting spikes | All weather protection Our standard Defender Plastic Bird Spike is for light pigeon infestations on ledges up to 4 inches wide. This means an area where the pigeons come and go during the day, but are not trying to nest or roost overnight. For a heavier infestaion where pigeons are already established and are trying to nest, we would recommend the Defender Stainless Steel Bird Spike for ledges upto 4 inches.