it's called door stickers, also called bumper strips and waistlines. Generally, the material is pasted by car, and the photo is covered with film. The north side can be white glue or black glue, but it is generally recommended to use white glue. If both the inside and outside are pasted, use black glue. The height varies from 11CM to 21CM, and generally 14 cm is enough. A meter is about a few dollars, which is usually done by small advertising shops, but they don't necessarily have machines. If you find a special photo inkjet factory, you can get the lowest price.