Anti-collision window stickers: 9 pcs anti-collision window stickers in 36 different shapes. Vivid patterns can effectively prevent birds from hitting the window glass. How to use: Make sure the surface is smooth and without texture; clean the surface to ensure there is no dust and grease on the surface; attach after spraying a little water and stability. Reusable window stickers: made of high-quality PVC material, sturdy to attach to windows and glass doors, does not require glue and requires no effort to peel off. Clear matte design: frosted transparent and visible from the outside and inside. We recommend that you attach the stickers to the outside of the window. Product description Material: PVC Removable and reusable Durable, non-toxic and no bad odor Double-sided print, visible from the outside and inside How to use: 1. Keep the smooth surface clean and free of texture, dust and grease on the surface. 2. Spray water on the smooth surface for easy movement and stability after attachment. 3. Tear off the stickers. 4. Apply the stickers and remove the remaining water. Package includes: 9 * sheets (total 36 pcs)