These spikes are an excellent low profile deterrent system for use on ledges, parapets, sign boards, beams, chimneys, cutouts, security cameras, lights etc. Pigeon spikes pigeons control product consists of engineering plastics and a clear U.V. Resistant base for long-lasting durability while protecting against target pigeons. Long lasting, extremely strong humane, nearly invisible. Easily glued to any substrate. Each unit spike width (1”.7) and length (2”.7) each Rft slot sections are easy to carry. Sections scored for easy break to install on smaller architectural details.