Bird-X 50 Ft Standard Polycarbonate Bird Spikes Dense Bird-X bird spikes with transparent needle strips keep birds from landing on roof ledges, window sills, signs and more. Plastic bird spikes are 4.5 inches high, 4.5 inches top width 1 inch flexible polycarbonate base. Package of 50 plastic bird spike strips, each 1 foot long. Birds instinctively fly to landing strips such as roof ledges, windowsills, building projections, signs, statues, trusses and beams. Bird Spikes keep them from landing. 5 Year Warranty against material defects and workmanship. Bird-X Bird Spikes TOUGH Long-lasting UV treated polycarbonate provides decades of maintenance-free protection. TRANSPARENT Does the job without marring the look of your property. It's practically invisible. DENSE Top branches protrude from the vertical shafts to give impenetrable coverage. No need to double up. FLEXIBLE Mounts easily on flat, curved or irregular surfaces whether wood, metal or masonry. EASY TO INSTALL Stackable. 12 sections attach quickly with Bird-X Bird Spikes special adhesive, nails, screws, or wire ties. ENVIRONMENTALLY FRIENDLY AND NON-LETHAL Nothing to rust or deteriorate. ECONOMICAL Sturdy plastic does the same job as stainless steel at a fraction of the cost. One-foot modules minimize waste. GREAT WORKING PARTNER Use a combination of visual scare, sonic and roost inhibitors as this is more effective than any single product. For most applications. Spikes are 4.5 high x 4.5 wide with 1 mounting base . NOTE ALL bird control methods prove more effective when different types of scare devices are used in combination. Products include light and sound repellers, roost inhibitors and visual scare devices. This item ships from a separate warehouse and may require extra time for delivery.