Giant suction cup is strong and durable. Great for holding decorative wreaths directly on windows, mirrors, and glass stain doors. The suction cups are engineered to hold tight on clean, smooth surfaces. Works indoors or outdoors. Not affected by extreme heat or cold. UV protected. Crystal clear plastic will not yellow in direct sunlight. Patented light diffusing ring prevents hazardous hot spots in sunny windows. Patented release tab makes removal easy. Rated to hold 20 lb. 1 per package.