Made of high quality blue anodized Aluminum , good thermal conductivity. | Size: 5.9 x 2.91 x 0.39 inch / 150 x 74 x 10mm (L*W*H), please make sure that the size of the heat sink fits that of your component. | This large big aluminum heatsink reduces the risk of hardware failure and power loss due to overheating, more safety. | Maximize surface area Designed in contact with the cooling air. The 378pcs fins increase the area of the board and thus provide for greater heat transfer. | Widely used for computer, Power Transistor, FET, IC, Power Amplifier, Voltage Regulator, MOSFET, SCR etc.