Fluoro-steel alloy

Fluoro-steel alloys are a Cybertronian alloy. Crowns are made from it.

Fiction

Marvel Comics continuity

Marvel The Transformers comics

To establish his leadership of the Autobots, Grimlock made the Dinobot Crown of Leadership and two other crowns, one made from fluoro-steel alloys. He asked which of the three Blaster and Goldbug preferred; Goldbug liked the fluoro-steel alloy crown for its sparkle. When Blaster revealed that they failed to find the Mechanic, Grimlock crushed the two crowns in fury. Mechanical Difficulties!