C5 is made up of Copper, nickel, zinc and small parts manganese and iron. There are tiny traces of other minerals as well, but you got the 5 big ones. Cheers!

C5 was aslo chosen because it is the same name for a military grade explosive of the time!

Correct. C = compound 5 = number of different metals used

Ok, since we are on naming...

Question for all: Why is the wire material called C5?

Oops Sorry. Newbie mistake for me. I didn't see the second page and thought i didn't answer the question.

Oak, you are right. 0.3 was the design that sparked the change to Zeros. It was developed from a napkin sketch from JJ to Peter Yee.

Negative. After another wrong guess and I'll give a hint.

Negative

No, I'm referring to Zeros. Subzeros already existed until a new design changed the look, feel and name. Which Zero kicked that off?

I hope its ok for me to post a question here. If not, apologies OP and moderator, please remove.

Question: Which Zero was designed first?