Features 1、This heat dissipation shell kit is used to prevent the motherboard from overheating, suitable for Raspberry Pi 4 B model. 2、Equipped with a cooling fan set, which can be used with the shell to make heat dissipation more efficient. 3、All ports and slots of the cooling shell can be perfectly matched for Raspberry Pi 4 B, which is highly practical. 4、Made of aluminum alloy, has good wear resistance and is not easy to rust and deform after long term use. 5、The open design can ensure that the CNC case does not affect the WIFI signal, and does not affect the use of the motherboard. Specification Item Type: Aluminum Alloy Cooling Case Material: Aluminum alloy Exterior Treatment: Anodic oxidation Compatible: For Raspberry Pi 4 B Model Package List 1 x Shell Upper Cover 1 x Shell Lower Cover 1 x Fan Set 4 x Thermal Silicon 1 x Hex Wrench 12 x Screws