There are optional,you can choose follow you like materials,cartoon doorstop make from materials smooth, and full of durability. the bottom works on most floor surfaces, not need to worry the door is easily closed by the wind or pets. The fluent outer shape makes this door wedges look more exquisite. It is extremely easy to use and just put it under the door bottom, not tools required The door wedges can not only be used as a doorstop but also as a desktop, house, car decoration Wonderful gift,sweet warm friend family and yourself Lovely DESIGN The decorative doorstop cartoon designs,which is brightly colored and looks realistic. Its adorable postures and expression will make you smiling every time you see it