Includes: a set of 10 windmills and accessories (including plastic rods) that can be replaced as desired. Each set of windmills is individually packaged. Each set measures approximately 19.68 inches in size. High quality materials: The wind turbine bird repellent is made of thick PVC material, resistant to aging and corrosion for long-lasting use. It is weatherproof and waterproof, and exposure to sunlight or rain will not degrade the reflection performance, which can be maintained for many years. Easy to install: The windmill requires assembly; detailed instructions are provided in the product image. Simply mount these scarecrow repellent pin wheels in your area where there is direct sunlight and a breeze for effective use. Safe and environmentally friendly: The silver mylar windmill is made of safe, non-toxic plastic material that does not harm the environment or animals. Instead of scaring birds and harming them, it deters them in a humane way by reflecting visible light. Use scenarios: - Protect fruit trees, crops, and garden plants in orchards or home gardens from birds. - Shield stored feed and grain in farms, barns, or outdoor storage areas. - Deter birds on rooftops, patios, warehouses, or other outdoor spaces that receive sun and wind.