Save birds from window collisions with these fun cardinal window clings! A small flock has been made for you to arrange however you like on your window. The prism effect breaks up the reflective light making your window more visible to birds, which reduces window collisions. These decals stick to the window purely with static cling, not adhesives, so they are movable, reusable and never fade. Comes in a package of 7 different Cardinal designs ranging in size from 4.5" to 7" across. Some are perched on branches, some are flying, but all of them are sassy and adorable! How to Use: Apply Window Gems to OUTSIDE of windows.After washing window well, apply gems smooth side toward the glass.A mist of water or swipe with a damp cloth helps them stick.Smooth down all edges flat against the glass.If applying in cold weather use warm water to rinse glass first.Gems can be rinsed if they get dirty and reused as many times as you like.They will not leave any residue on your windows.Made in the USA