Use these anti-collision stickers to warn birds, pets or people and avoid collisions on the window glass. Perfect for verandas, bay windows, glass doors, etc. - Sticker shape and size: tree leaves of different sizes. - Number of stickers in the package: 39. - Color: dark green. Stickers are colored on both sides. The color is visible from the outside and inside. - Material: high quality vinyl resistant to any weather for many years. - Instructions included. - For people/pets: place the stickers at eye level. For birds: place the stickers on the outside of the glass. - Place the stickers in all areas of the window. Leave 1-2 feet maximum between 2 stickers. - For decorative purposes: stickers can be placed on walls or other flat surfaces. Mix with other shapes if you want a colorful decoration.