C7 100' Magnetic string on 12" Spacing 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 C7 socket to your metal surface saving time and labor cost. We use Neodymium grade magnets which are the strongest magnets available. Each magnet is plated with a nickel protective coating which prevents rust. Our magnetic 100-foot, White wire stringer can be used with ourC7 Ceramic5 watts bulbs,C7 Transparent5 watt bulbs,C7 LED Plastic FacetedandCeramic.8 watt bulbs,C7 LED glass.6 watt bulbs, and our Incandescent and LEDG30andG40bulbs. Please look at our FAQ tab to find more information.