Features:Aluminum heat exchanger can used for CPU， CO2 Laser， etc water cool system.Density of Heat Sink: 18 zigzag\/inchFlat Pipe: 12Fan Installation Hole: Approx. 10.5x10.5cmFor Pipe Diameter: Approx. 6mmHeat Exchanger size: Approx 15.6 x 11.5 x 2.8cm(the main ody size of Exchanger)<br>Package Included:1x Aluminum Heat Exchanger