You won't see any more yellow butt caps on the tour, there are no Volkl sponsored players. The yellow butt cap was the regular butt cap with color filled in and a Volkl emblem sticker affixed to it.
Dancevic is playing a stock C10 with a little weight added to it. He stencils because he gets his rackets for free, there is no additional endorsement. This is a case where the pro actually prefers the frame, kind of like Connors and the T2000. Again, the rackets are out of regular production.
There is no dampening system on any C10 unless you call a butt cap with two pieces of foam about 1/8" thick a 'system'.
Wilson Steam 99S poly Luxilon 4G 1.25 @ 45