LEGO Transparent Light Blue Lightning Bolt (Double) with Marbled Transparent Purple (28555 / 59233)

LEGO Transparent Light Blue Lightning Bolt (Double) with Marbled Transparent Purple has been used in at least 45 LEGO sets over the past 17 years, since it was first used in 2007. You can also find this part in at least 4 other colors. It has the design IDs 28555, 59233 which can usually be found molded into the bottom of the part.