Small and lightweight aluminum alloy material High hardness, metallic luster, resistant to rust, lightweight and durable aluminum alloy material promotes efficient heat dissipation The aluminum case with metal shell enhances heat dissipation and provides comprehensive protection for your motherboard Full coverage and complete protection; after repeated testing, each cutout is precisely matched to the motherboard for thoughtful protection Specifically designed for Raspberry Pi 4B; Raspberry Pi 4B has a different interface from 3B+/3B, and cases are not interchangeable Compatible model: Raspberry Pi 4B Color: Black Material: Aluminum alloy Package Contents: 1 x Aluminum Alloy Top Cover 1 x Aluminum Alloy Bottom Cover 3 x Thermal Pad 1 x Wrench 1 x Cooling Fan 8 x Screw The package includes only the items listed above; other items are not included Note: Lighting and different display settings may cause slight color variations compared to the actual product. Measurement error allowance is +/- 1-3 cm