Description: Durable MaterialThese window stickers are made from PET plastic material. They will reduce reflections on the glass and remind birds to stay away. They can serve as warning signs. Bird ProtectionBirds don't understand glass as an invisible barrier, thinking the glass reflects habitats they can fly into. These anti-collision decals help prevent birds from hitting windows and sliding glass doors. Home DecorationThese window stickers are not only an effective solution to prevent birds from hitting windows but also a rainbow prisms sticker that reflects sunlight to create a beautiful rainbow for your room. Easy to UseClean the glass surface and spray water on it. Then, stick the decals on the glass with dot glue and scrape off air bubbles. Remove the protective film at last. The process won't cost much time. Practical GiftYou can send these window stickers to your family or friends to help them protect their windows from birds or decorate the surfaces. It will be thoughtful and helpful. Installation Notes: 1. Take out the stickers. 2. Apply dot glue(traceless glue) to the back of the stickers. 3. Stick them on the wall. 4. Tear the protective film. Specification: Material: PET Color: iridescent Feature: shiny Size(approx.): (diameter from smallest to largest) 8cm/3.15inch, 10cm/3.94inch, 12cm/4.72inch, 15cm/5.91inch Package Included: 20 Pcs x Window Stickers(varied in size) Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-2 cm differences due to manual measurement.