By now I'm sure you all would have heard of the company Kanie and it's popular all copper heatsink called the Hedgehog-238m, which has been made famous by many tech websites around the world. As the heatsink is built fully out of copper, it is very heavy, in fact the heaviest and most solid heatsink I have ever held weighing in at around 460 grams. As you can see from the picture below, the base allows for this heatsink to be used on all socketed processors. Another version of the Hedgehog is available which is designed for slot processors, which is very expensive as more copper is required compared to the Hedgehog 238-m. Here is a picture of the base of the copper heatsink...
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