IMAGE Aluminum Water Cooled Single-Row Heat Exchanger Radiator Water Cooling System For PC CPU CO2 Laser With USB SD Card Reader 100% aluminum heat sink,17-20piece(1") Micro channel(12 pipe). Brazing Process. Increase efficiency of heat exchange Fan Installation Hole 105mm *105mm(Assembly 120 Fan) Package Included: 1 x Aluminum Heat Exchanger, 1 x USB SD Card Reader