describe: Anti-Climbing Safety Nails; No more putting yards of debris into concrete or sharp barbed wire or razor wire to harm animals or even humans. Bird spikes are an effective way to prevent different animals from climbing the boundary wall or crossing the border. GREAT VALUE 12-PACK: Each plastic strip measures 16.9 x 1.5 x 1.4 inches (43 x 3.5 x 34 cm). Each box comes with 12 durable plastic strips that cover nearly 17 feet, preventing different animals from climbing over the boundary wall or crossing the line. PREMIUM MATERIAL: Our bird pegs are made of high-quality, durable polypropylene plastic, suitable for all climates. The cleats are also weather-resistant. Unlike metal bird nails, it will not deform or corrode in strong sunlight. They can be coated with any plastic-specific coating. Easy to install: You can use nails/screws to secure the bird studs in place, or secure with strong zip ties. Each strip has 18 holes to help secure the strip. These cat nails are easy to install on any flat surface such as fences, roofs, sheds, ledges, patios, railings, walls, gates, etc. Effective and safe against intruders: Deter intruders such as birds, raccoons, cats, dogs and even human intruders from passing through the perimeter of your yard, garden, patio, windows. Anti-climb safety pegs repel safely without harming animals. (Not recommended for squirrels!) Effective and safe against intruders: Deter birds, raccoons, cats, dogs and even human intruders from passing through the perimeter of your yard, garden, patio, windows. Anti-climb safety pegs repel safely without harming animals. (Not recommended for squirrels!) Packaging contents: 1 box of anti-cat spines