Use these polycarbonate strips to protect the underlying surface from Woodpeckers and Swallow nests. ALSO USED TO CLOSE THOSE OPENINGS IN BUISINESS SIGN LETTERS. Install over the area to be protected using Bird Barrier Bond. Supplied with 3 strips of double side adhesive to hold the strip in place while the bond dries. Package of 8 strips, 4' long by 8" wide.