A closer look
The Pentagram NXC 100-Cu is made from all copper fins. There are other versions available which substitute part of the copper fins with aluminum to reduce cost. An even lower cost version uses only aluminum fins making it very light and cheap. Also models with smaller footprint or less height exist.
This small fan controller is included in the package. Using the little knob you can freely change the output voltage between 5V and 12V. It is very easy to use and seems to work great. In the third photo you can see a small metal heatsink shine through, good engineering.