Features: 1.Perfect Compatibility: Practical accessory, aluminum heatsink for Raspberry Pi 4 B type motherboard. 2.Aluminum Alloy: Heatsink is made of premium aluminum alloy, which has high hardness and is not easy to rust, which is conducive to heat dissipation. 3.Safety Protection: Heatsink has excellent sealing, safety shielding cover, and guards the motherboard. 4.3 Heat Dissipation Columns: Embedded heatsink with three heat dissipation columns to enhance the heat dissipation effect of the aluminum alloy itself. 5.Multiple Interfaces: Heatsink Cooler has rich interfaces, has a variety of interfaces, and has high expansion capabilities. specification:Item Type: Heatsink Material: Aluminum Alloy Applicable Models: for RasPi 4b PackageList:1 xShellUpper Layer1 x ShellLowerLayer1 x Hex Wrench4 x Screws4 x Heat Sinks