Last year they played the 5.0 stretch painted like the Surge.
I have played with Mike Brian on a Pro-Am doubles tournament of Daimler-Chrysler. I am playing the 5.0 stretch by myself and he told and showed me that his racket was the same. On the racket was a technifibre string.
They are very nice and pleasant peoples. It was great fun to meet them and play tennis with them