Feature:1. Integral aluminum alloy manufacturing for better heat dissipation performance.2. Slotted design at the end of the shell does not affect wifi/Bluetooth signal.3. Cooling shell fits for 4B board for better working performance.4. Dual layer heatsink case with high hardness and durable quality, provides protection.5. Can protect your board from bumps, scratches, and dust, comes with hardware for easy operation.Specification:Condition: 100% Brand NewItem Type: Case for Raspberry PiMaterial: Aluminum AlloyColor: BlackApplication: Fit for 4B Package List:2 x Thermal Adhesive4 x Screw1 x Hex Wrench1 x Aluminum Alloy Shell Upper Layer1 x Aluminum Alloy Shell Lower Layer