Save birds from window collisions with these prismatic dragonfly window clings. Window Gems break up reflections on the glass and warn birds away in time to avoid window strikes. Comes in a package of 9 Clings: 3  large (6" across), 3  medium (5" across) and 3 small (4" across) They are a mix of 3 different designs. Window Gems break up reflections on the glass and warn birds away in time to avoid window strikes. Our clings stick to the window purely with static cling, not adhesives, so they are movable, reusable and never fade. Window Gems are made with a prismatic vinyl which captures sunlight and turns it into rainbows all over your house. They are stunning, constantly changing, and perhaps a teeny bit magical. Any light source makes the gems glow with rainbows, even moonlight. Handmade in Mount Shasta, California