20 Pieces Large Size Hummingbird Window Hummingbird Decals for Windows Anti-Collision Window Clings Decals to Prevent Bird Strikes on Window Glass Non Adhesive Vinyl Cling Hummingbird Stickers Specification: Size: about 5x 7 inch Material: non adhesive vinyl cling Protective and aesthetic window decals: Hummingbirds clings are double side printed, thus the beautiful "hummingbirds" can be clearly seen from both outside and inside, which makes them not just a prevention for windows and birds, but also a great decoration. Apply to: These window clings can be well applied to glass panels, patio doors or bay windows to prevent bird from striking on window glass. Simply apply the butterfly decals to the inside surface of the window and no adhesive is required. How to use: Step 1: clean the window with a duster. Step 2: spray a mist of water on the glass. Step 3: peel off the butterfly window cling from the vinyl backing and place it on the window in any design you like. Packing content: 20 x Hummingbird anti-collision window clings