These high-quality, US-made ties are built with carbon black for the best protection against UV light. Use for cage construction, bundling wires, hanging air lines, etc. Releasable ties are just as strong but can be reused, perfect for extension cords and rope storage. Keep different sizes on hand. Tensile strength can be doubled by wrapping the tie around the object twice, tripled by wrapping 3 times, etc. Sold per package. USA.