Heat sink is a device to dissipate heat to the heat-prone electronic components in electrical appliances, mostly made of aluminum alloy, brass or bronze into a plate, sheet, multi-piece, etc., such as the CPU central processing unit in the computer to use a large heat sink, the power supply tube, line tube in the TV, the amplifier tube in the amplifier to use heat sink. General heat sink in use to electronic components and heat sink contact surface coated with a layer of heat-conductive silicone grease, so that the heat emitted by the components more effectively conducted to the heat sink, and then distributed to the surrounding air by the heat sink.