1. Easy-to-install anti-bird spikes to protect fences, window ledges, guttering and roof cavities, even can be installed on round surfaces. 2. Repel bird, such as Seagulls, crows, pigeons, starlings, sparrows and more. 3. Great for balconies, roofs, barn rafters, commercial signs, patios, parking lots and more. 4. Humane, would not harm birds! 5. Material: plastic base and stainless steel
