Welcome to our store! 1. The shell is made of aluminum alloy, which contributes to better heat dissipation. 2. Dedicated for Raspberry Pi 4B, striped aluminum alloy material, thick and good hand feel. 3. The product has dual fans; dual fans offer better noise reduction and a better cooling effect. 4. The entire shell is passively dissipated, and the heat transfer and heat conduction column are dissipated to the entire shell for heat dissipation, which works more efficiently and better protects the development board. 5. Can access all ports and slots on the Raspberry Pi 4 Model B, such as USB-C power connector, micro high-definition multimedia interface port, audio port, USB port, SD card slot, camera port, GPIO port, display slot, etc., thermal pad covering all heat components except wireless. Item Type: Aluminum Alloy Shell for Raspberry Pi Material: Aluminum Alloy Application: Raspberry Pi 4B 1 Set Cooling Fan (2pcs) 1 x Hex Wrench 12 x Screw 4 x Silicone Pad 1 x Card 1 x For Raspberry Pi Shell Upper Part 1 x For Raspberry Pi Shell Lower Part Customers are our top priority. If you find any issues with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best customer service.