These oil and water columns are great for your model layout. To use them, simply place them on your layout where you want them. Since they've been previously installed, handle them gently as they might be a bit fragile. When it comes to maintenance, you can use a soft, dry cloth to clean the custom - painted surface to keep it looking nice. If you need to move them around, make sure to do it carefully to avoid any further wear. And remember, they don't come with the original box, so keep that in mind when storing them. When it's time to ship them back (if needed), follow our return policy and make sure to pack them well to avoid damage.