Kupo suction cups offer a temporary solid light mounting solution on smooth nonporous surfaces. They are great for mounting small lights; cameras and accessories to windows, mirrors, automobiles, boats and any other smooth nonporous surfaces. Because of the excellent rubber material with silicon, Kupo suction cups can be used at temperatures from -12 degrees to 49 degrees c (10 degrees f to - 120 degrees f). A red-line indicator is equippedwarning of any vacuum loss due to adverse shooting conditions. The Kupo 6" ( 15.24 cm) pumping suction cup comes with a fixed 5/8" baby receiver ( supplied with pad protector) Max loading: 70lbs (32kg) weight: 1.1lbs (0.5kg) provides a great mounting solution for lightweight lighting, video camera or sound recording equipment on smooth and nonporous surface.