There is no need to throw out an entire string of lights ever again, keep yourself prepared this holiday season. Extend the life of your holiday lighting with this pack of 4 opaque blue replacement bulbs. This set of bulbs is UL certified and approved for both indoor and outdoor use. Product Features: Pack of 4 C9 holiday replacement bulbs Finish: opaque Color: blue Size: C9 (intermediate base) UL certified and approved for both indoor and outdoor use 120 volts, 7 watts Ceramic bulbs with brass bases Pack includes 4 of the bulb shown Dimensions: 3.25" high x 1" diameter Material(s): ceramic