i herd whispers that he used luxilon big banger original 17, but im not sure how truwe this is.. id be very interested to know as id give it a go in my instinct and see how it plays!
I think it may just be.....Head Fibergel.....Polyester string.
I looked at it close up, and I looked at the string that is in my coaches Flexpoint and it looks the same?
Dunno if thats what it is, but thats what it looks like to me.