Bird-B-Gone Polycarbonate Spikes are a humane, cost effective, permanent solution for preventing large pest birds from landing on flat or curved surfaces. The Polycarbonate Spikes come in two-foot sections, 50 feet per box, and are made from a UV protected polycarbonate plastic. The spike strips are available in three different widths; 3", 5" & 7", to accommodate the area of the surface being treated. The base of the spike is 1.5" wide, and can be glued, nailed, or tied down to most surfaces. The height is 4 3/4". Bird-B-Gone Polycarbonate Spike carries an industry leading 5-year guarantee.