Heatsink Material: Brass, Stainless steel Black Alphacool is an internationally renowned company in the field of water cooling solutions for both industrial and home users. To ensure that customers receive the best products available, Alphacool is constantly developing new products and making improvements to existing products.Make No Compromises, Use Copper.As usual, Alphacool uses pure copper for the NexXxoS ST25 slim radiators. The end chambers, the water channels and the cooling fins are all made of copper, a unique selling point worldwide. No other manufacturer relies on pure copper for all these components combined. As a result, Alphacool has been producing one of the most popular and highest performing radiators on the market for many years, providing the perfect foundation for every water cooling system.Full Cooling CapacityTo maximize the performance of a radiator, Alphacool reaches deep into its bag of tricks. Copper is the starting point. With a thermal conductivity of 400 W/