Novelty Lights 25 Pack of vintage traditional twinkle C7 Christmas Light replacement bulbs have bright and vibrant coloring that will provide years of use for your Christmas light display. These bulbs are made to twinkle at random for the desired effect. These 7-watt, 120-volt bulbs with an E12 candelabra base will shine for 3,000 hours and have nickel-coated bases to prevent corrosion. These twinkle multicolor C7 replacement lamps can be used inside or outside to decorate roof lines, patios, and walkways. Each bulb has a candelabra base (E12) 2-1/4" tall and 1" wide. These bulbs screw into our C7 Stringers (25' & 100'), our E12 Heavy Duty Light Strings (25', 100' & 330'), our commercial grade bulk 1000' C7 spools as well as our vintage Twisted Wire Strings with E12 Bakelite Sockets.