About this item Anti-collision Prevent birds from crashing into your window panes with colorful bird flower branches. Indoor and outdoor - Each individual design is printed on both sides using our innovative printing process which allows you to admire the design from the inside and outside, and allows birds to see the window. Clean installation and easy - Thanks to static electricity, no adhesive required. 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 27cm x 60cm and can be used to decorate any window or door in your house or garden greenhouse.