With a bit of TLC your nib holder should last a very, very long time. The metal on the holder has been waxed to reduce oxidisation. Over time the metal will age naturally, developing a richer, darker tone. You can choose to embrace this patina or to return it to it’s gleaming best by using your polishing cloth with a splash of water and dish soap or a gentle, polishing compound. Newly polished metal can be waxed with Renaissance Wax to protect the surface and avoid further tarnish.