C7 Transparent Incandescent Christmas Replacement Bulbs - Outdoor Lighting - String Lights - Christmas Lights 25 Pack of Traditional C7 Transparent Christmas Lights have bright and vibrant coloring that will provide years of use for your Christmas light display. These 5-watt, 120-volt bulbs with candelabra base will shine for 3,000 hours and have Nickel-coated bases to prevent corrosion. These transparent C7 replacement lamps can be used inside or outside to decorate roof lines, patios, Christmas Tree's, and walkways. Candelabra base (C7/E12) 2-1/4"" tall and 1"" wide. These bulbs screw into our C7 stringers (25' & 100'), our E12 Heavy Duty stringers (25', 100' & 330'), our commercial grade bulk 1,000' C7 Spool as well as our vintage 250' Twisted Wire E12 Heavy Duty Spools. Your satisfaction is our #1 priority and if you have any issues at all please us and we would be more than happy to assist. Ordering the wrong size bulb is common so please reach out with any bulb size questions.