Select Bird Spikes are designed to provide an effective deterrent of birds. The pointed spikes are a barrier to the birds, preventing them from landing on surfaces. Where to Use: These spikes can be attached to building ledges, balconies and backyard fences to prevent birds from landing without harming them in any way. Ideal for use on ledges, beams, rafters, railings, window air conditioners, signs, windowsills, gutters, roof perimeters, awnings, support structures, chimneys, signs, lights, poles, trusses, building projects, in some situations statues or anywhere birds like to land, nest, or roost., Technical Description: Material: GI Galvanized Powder Coated Metal Sheet Arrangement: Interleaving Spikes Multi-Height Tool Formed Advantage: No Debris Holding, Multi-Height Spikes, Spaced Scientifically. Confuses Birds Maintenance: Zero Maintenance, does not break or fall off Tolerance: Withstands Coastal and tropical Climatic Conditions, does not corrode or rust Life: Last Longer (7-8 Years) Life Design: Inspired by Nature (Locust tree spines). Scares Birds away, Versatile, Multi-Height, Select Spikes is a single sheet tool formed Galvanized Steel metal sheets stamped to give you uneven spikes strengthened with ridges of steel projections protruding up and out angled at opposite ends. Appearance: Esthetical, suitable for all facades and terrain installation Eco-friendly: Environmentally Bio-degradable Polystyrene powder coated: Nano Technology using Henkel German Technology Pests Repelled Select Spikes are ideal for use with medium-sized birds such as pigeons, grackles, starlings, crows, and blackbirds, and also make spaces unappealing for seagulls and gulls, sparrows, swallows, bats, some climbing animals and cats and rodents.