Shakanium

Shakanium is a reference to the Marvel substance vibranium. It is the strongest metal.

Appearances
A shield made of shakanium has been used by Leader USA.

S Tier had a fridge made out of the material after they kept breaking D Tier's fridge. It is unknown what happened to the fridge after S Tier realized D Tier wouldn't be able to open it in its current state. It is likely it was not installed in D Tier's appartment, as S Tier has referenced continually breaking their fridge.