Magnets can only be influenced by, and attracted to, "ferrous" materials. A ferrous material is any metal which relates to or contains iron.Obviously magnets will not attract to wood, plastic, fabric, rubber, cardboard, etcBelow you will find a list of common building and project materials.YES:    Iron    Mild steel    Sheet metalNO:    Aluminium    Most stainless steel    Copper    Gold    Silver    Bronze    Lead