NO adhesive Easy to remove Reusable Not Sticky Window Cling,it's avoid smearing the window glass or door How to use: Spray little water on the window,they stick all by themselves Iit will be firm and easy remove Huge Size 3D affect Adjustable the size to fit all Windows The way it's printed makes the images look 3D It is perfect for any spooky occasion or party. Kids will love it Measures Size: 23.6 Width x 17.7 Height (60cm*45cm) by each one window posterGreat 4D affect Voice of buyer: The way it's printed makes the images look 3D Looks awesome Voice of buyer: I taped these inside my kids windows and had strobes going off slowly behind them The trick or treaters loved this Voice of buyer: This was my best Halloween find yet The neighborhood kids loves seeing this up in our windows Definitely gave some a fright