FrostyTech has posted a review on the Thermal Integration TI-V86-15 Copper Core Heatsink

Being the curious type here at FrostyTech, we ripped one of these heatsinks down to its component parts to se how well they were assembled. The copper slug is turned and polished before it is installed in the aluminum fin section, so the surface finish is very smooth. Conversely, the aluminum fin section looks like it has been reamed and then polished on the inside. The cavity has a mirror finish on the inside. >From that point, if I remember my Mech Eng. right, the aluminum section would be heated up, and the copper slug cooled and pressed into the cavity with a hydraulic press of some description.

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