Package Included:1 x Aluminum Heat ExchangerFeatures: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. 10.5 x 10.5cm/4.13 x 4.13inchFor Pipe Diameter: Approx. 6mm/0.24inchHeat Exchanger size: Approx. 15.6 x 11.5 x 2.8cm/6.14 x 4.53 x 1.10inch(the main body size of Exchanger)