About this item Anti-collision Prevent birds from crashing into your Dandelion stained window panes. Indoor and outdoor - Each individual design is printed on both sides thanks to our innovative printing process which allows you to admire the design from the inside and the outside, and allows birds to see the window. Clean and easy installation - Thanks to static electricity, no need for adhesive. Just spray a little water to apply the sticker. Your windows are therefore not damaged, and you can easily peel off and reuse your hummingbird stickers on other windows. Dimensions - They all measure approximately 30cm x 54cm and can be used to decorate any window or door in your house or garden greenhouse.