Resilient, long-lasting 18 x 16 mesh, 0.011 diameter screening woven with PVC-coated fiberglass yarn. Will not crease, dent, or unravel. Withstands all climates including salt air and industrial fumes. Easy to install. Fire-resistant, conforms to U.S. ASTM standards. Used by Do-It-Yourselfers. Enough to cover 2 average size windows or 1 screen door per Ready Roll.