Here it is! The most amazing drivetrain possible. Perpetual motion machine. Just read Prolly's "official" review...don't forget the lubricity and hardness.

Titanium nitride (TiN) (sometimes known as “Tinite” or “TiNite” or “TiNi”) is an extremely hard ceramic material, often used as a coating on titanium alloys, steel, carbide, and aluminium components to improve the substrate's surface properties.

Applied as a thin coating, TiN is used to harden and protect cutting and sliding surfaces, for decorative purposes (due to its gold appearance), and as a non-toxic exterior for medical implants.