C9 and C7 Magnetic stringers used for homes, office buildings, barns, and restaurants. These magnetic sockets will adhere to any ferrous metals(Iron and Steel) making for quick installations since there is no need for christmas light clips. Perfect for rooflines, building flashing, and gutters.  No need for screws, glues, clips just adhere the magnetic socket to you metall surface saving time and labor cost.  We use Neodymium grade magnets which are the strongest magnets available.  Each magnet is is plated with nickel protective coating which prevent rust.