Dimmable C9 blue twinkle bulbs that fit most traditional E17 sockets, including C9 light strings and candles. They are blue in color and consume 5 watts of power. Use them as replacements for standard light sets or combine them with one of our many C string varieties to build your very own custom length stringers. They can be used with a dimming device. They come in packs of 25 bulbs. UL listed for both indoor and outdoor use.