A fun way to keep your birds safe and prevent window collisions! These wolf decals stick to the window purely with static cling, not adhesives, so they are movable, reusable and never fade. Comes in a package of 9different clings ranging in size from 7" long for the largest wolf to 3" for the cubs. The 1 crescent moon is a little over 2" high. 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