So i have a Formula Vi and Dual Poseidons I have been curious as to what the water blocks are made of and I still haven't found that information after searching for days.. My real question is as i get ready to install my first custom loop will the metals react. Now i no that metals shouldn't react with each other but i also know that most of the **** in my p.c. are made of composites so that worries me... I could use a few pointers here....