These one piece Anglo American self closing suction cup light holders for fairy lights are used for flat, dry, clean windows. The self closing design grips lights more securely and keeps them closer to the window than other types with long protruding clips and therefore makes them safer. Works inside and outside in temperatures down to minus -29°C. The clean glass surface should be above 5°C when first applying. Adams suction cups are now Phthalate-free.