Save your feathered friends from window collisions with these delightful dinosaur clings. The prism effect breaks up the reflective light making your window more visible to birds, which reduces these 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 dinosaurs ranging in size from 4" to 6" across. Made in the USA 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.