Anti-seizing copper assembly paste.
The Copper Paste is a copper-based assembly paste. This paste allows components (pedals, seatpost, etc.) to be assembled with complete peace of mind. This assembly paste has been developed to prevent two metal parts from seizing. It also inhibits parasitic noise and prevents loosening. It is safe for all materials used on bikes.
Features

Anti-rust: High protection against corrosion
Water resistant: Exceptional resistance to water, salt water , mud, weathering and washing 
Anti-seize / Anti-cold welding: Avoids cold welding on aluminum, titanium and steel components
Preserves friction components: Prevents cracking and therefore reduces noise
Harmless: Safe for plastics, carbon and rubber