Use these ‘anti-collision’ clouds stickers to warn off birds (or people, pets,…) so they are prevented from bumping into window glass. Perfect for verandahs, bay windows, glass window panels… Set of 20 cloud silhouettes of different shapes and sizes – see picture. An instructions sheet with pictures explains how to place them step by step. When the sun’s rays fall on glass panels, verandah doors or bay windows these surfaces can act like mirrors. These cloud decals prevent bird strikes. Stickers are colored on both sides. Color of the stickers is visible both from the outside as well as from the inside. It is advisable to apply them on the outside surface of the glass to avoid mirror effect. High quality materials with long-lasting adhesiveness ( will not fall off over time, resistant to rain, freezing weather conditions and cleaning agents )… and their color will not fade over time either. If you possess large windows then it is advisable to apply a greater number of stickers (from the bottom to the top, without large empty surface).