OFFO Bird Spikes Pre-Assembled for Roofs and Windows, Durable Pigeon Spikes for Deterring Crows, Seagulls and Small Birds, Bird Deterrent Spikes SetFeatures [Efficient and Humane Bird Spikes] The stainless steel bird spikes have a visual and physical deterrent to birds. It can deter pigeons or other birds from landing on your house to nest or produce droppings. No harm to birds,and achieve peaceful coexistence between people and nature. Effective solutions to your problems. Product Description OFFO Bird Spikes Pre Assembled for Roofs and Windows, Durable Pigeon Spikes for Deterring Crows,