Save birds from window collisions with these prismatic circle window clings. They break up reflections on the glass and warn birds away in time to avoid window strikes. The decals stick to the window purely with static cling, not adhesives, so they are movable, reusable and never fade. Comes in a package of 10 circles in 2 different sizes. There are 5 x 3.5" circles and 5 x 2.5 " circles. Handmade in Mount Shasta, California Window Gems are made with a translucent prismatic vinyl which captures sunlight and turns it into sparkly rainbows. They are stunning, constantly changing, and perhaps a teeny bit magical. Any bright light source makes the gems glow with rainbows, even moonlight.