Feature:1. This housing made of aluminium alloy material has great thermal conductivity, which will also protect for Raspberry Pi 4B.2. The built in heat sink is in close contact with the on board for Raspberry Pi chip, so there is no more overheating problem.3. Advanced manufacturing process has improved the quality of aluminium alloy, thus the durable casing is not easy to rust.4. All ports and slots of the case can be perfectly matched with for Raspberry Pi 4B, adding more convenience to installation.5. Compact in size and light in weight, providing complete protection and efficient cooling without affecting the operation.Specification:Item Type: Aluminium Case for Raspberry Pi 4BProduct Material: Aluminium AlloySurface Treatment: Anodic OxidationCompatibility: For Raspberry Pi 4 B. .Package List:1 x Upper Cover of the Aluminium Case for Raspberry Pi 4B1 x Lower Cover of the Aluminium Case for Raspberry Pi 4B3 x Thermal Conductive Silicone4 x Screw4 x Non Slip Pad1 x Hex Wrench