C9 Magnetic Christmas Light Spool with a total length of 500 feet with 400 C9/E17 sockets spaced 15 apart, on SPT-1 wire. This is a commerical grade product made to stand up to all weather conditions. Use for office buildings, metal fencing, homes, restaurants or anywhere you wish to create an amazing look. The magnets are made with neodymium grade magnets and have a protective nickel coating. Using these magnetic sockets will eliminate the need for clips, screws and glue. PLEASE ENSURE YOUR SURFACE IS A FERROUS METAL (STEEL OR IRON). MAGNETS DO NOT STICK TO ALUMINUM SIDING AND GUTTERS. Available colors: Green, White, Brown, Black. Also available in 12 spacing.