The Noctua NH-U12P SE1366
As you can plainly see, this is in fact a NH-U12P, as promoted; there aren't any modifications done to the amount of fins or the tried and true design of their coolers. This is a four heat-pipe cooler and both the pipes and the base are nickel plated copper, the fins remain, Noctua logo stamped, aluminium.
From the side you can see the staggered placement of the heat-pipes within the fins. This allows for each pipe to get more airflow directly on each heat-pipe. The side bends of the fins are there for support, but also aid in keeping the air directed to the rear, instead of letting it get wasted out the sides.
The top of the NH-U12P is made to accept both fans that Noctua has included with the SE packaging. The fins edge design is to increase airflow across them. Both the top and bottom outer tips on the fins are designed to snuggly hold a 120mm fan at the proper spacing to the fins edge, again to maximize airflow.
Here we have the top of the business end of the Noctua. They have taken a copper base and soldered the four heat-pipes and the top mounting plate for better heat transfer. They are in fact all copper, but have been plated in nickel for both keeping the oxidation off and for aesthetics as well. Lastly, the plastic "cup" the base is set in is stable enough to support the cooler while you are working to keep any minor mishaps from damaging it.
Here we have the business end of the NH-U12P SE1366. The camera actually picks up the milling marks more than the visible eye; this design isn't as prominent when just looking at the base. Checked against a razor, I find the base is flat as can be in every direction.