Iron filings can be used to show magnetic fields created by magnets (such as in the picture to the right). Magnets only attract certain types of metals, other materials such as glass, plastic and wood aren't attracted. Metals such as iron, nickel and cobalt are attracted to magnets. Most metals however are not attracted to magnets, these include copper, silver, gold, magnesium, platinum, aluminium and more. They may however magnetize a small amount while placed in a magnetic field. Magnetism can attract magnetic objects or push them away.