John Isners String?
 

It looks awesome in his black racquet and red string. What is the string?

Either tecnifibre red code or pro line II, I can't remember which. I'm leaning towards PLII.

There's a thread around here. Pro Red Code.

ok cool, it looks super sweet

Drauklie strung his racquet at an event he was playing at

Believe he switched from red code to pro line II

I think its the other way around

I believe Mike is right

http://www.tennis-warehouse.com/play...ccode=RFEDERER

It also says federer still uses champion choice when he has been playing with 4g

http://www.tennis-warehouse.com/play...code=SWILLIAMS

And Serena only playing with 4g when she uses a hybrid

Federer doesn't and never played with 4G

http://tt.tennis-warehouse.com/showthread.php?p=7056418

Google is your friend