Polycarbonate Standard Bird Spikes in 25 Ft Length from Bird-X Dense, transparent needle strips by Bird-X block pest birds from their landing strips . Bird-X Bird Spikes, the most effective keep off sign one can post.Top Width 6.5 Inches. Height 4.5 Inches. Polycarbonate Base 1.0 Inches.25 Foot Length 25 Strips Birds instinctively fly to landing strips such as roof ledges, windowsills, building projections, signs, statues, trusses and beams. But now you can keep them from landing on your property ... Easily, inexpensively ... and permanently! Bird-X Transparent Needle Bird Spikes TOUGH Long-lasting 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 ormasonry. 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 Using combinations of visual scare, sonic and roost inhibitors have proven 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.