Durabyllium
Durabyllium is, like every other metal in Transformers, the strongest metal that exists.
Fiction
Generation 1
Bios
The Technobot Nosecone's altmode's drill can pierce almost anything and is practically indestructible because it is made from durabyllium-steel alloy. Nosecone's toy bio
Marvel Comics continuity
Shooting the tank in front of Autobot Headquarters and doing no damage at all, either Rumble or Frenzy guessed that the vehicle was tougher than a block of triple-strength durabyllium steel. Command Performances! He was correct. Dread Tidings #285
Unicron Trilogy
Durabyllium is the hardest metal in the galaxy and it is used in the construction of all Transformers. Optimus Prime vs Megatron: The Ultimate Battle
Prime
Among other items, Starscream selected a durabyllium drill to install his treacherous clone's T-cog on himself. He never got to use it, however, since he got curious when he detected the Decepticons dispatching four teams to locations around the globe. Triangulation
Notes
When "Command Performances!" was reprinted in The Transformers Classics, Vol. 2, a printing error caused the metal to be mis-spelt as "Durasyllium".
