Made from high quality Nylon and are UV rated. As such, they are designed for both indoor and outdoor use, including direct sunlight. These high quality Ties are used in the satellite and cable industries with amazing results. They are approved for DIRECTV (now AT&T), Satellite Dish, Comcast, and similar companies. They are approved for use on Coaxial Cables, Cat5 Cables, and similar communication lines - as they will not crush or distort the signal. Rated at 50lb / 222n Tensile Strength, these ties do not break easily, and are designed to last. They hold great amounts of weight.