I have a pair of these, one HR-09U and one HR-09S. They are very nice quality and are every bit of the expected Thermalright sexy that would be expected. However, the fit is a bit of a disappointment for the reasons stated below.

They are indeed nickel plated copper. I know this because I had to take a dremel to one of the damn things to get it to fit on my P5W. The short side was too short to cover the entire row of MOSfets adequately and the long side was too long to fit within available space without interference. The "foot" wouldn't fit between the capacitor and the four pin auxiliary power plug at the end of the Mosfet row. Rather annoying. If you choose to dremel the thing down to fit then you can forget about using the clips as the clip pins still overshoot the holes.

For those who need to know: The large sink is 80mm x 12mm at the "foot". The small sink is 57.5mm x 12mm at the "foot".