LEGO Transparent Light Blue Fire Wing with Marbling (18394 / 29331)

LEGO Transparent Light Blue Fire Wing with Marbling has been used in at least 6 LEGO sets over the past 8 years, since it was first used in 2016. You can also find this part in at least 3 other colors. It has the design IDs 18394, 29331 which can usually be found molded into the bottom of the part.