This is an aluminum alloy case designed for the Raspberry Pi 4 B computer. It's an excellent passive cooling enclosure that helps dissipate heat from the Raspberry Pi 4 board. Ultra-thin design - Only 14mm thick. Passive cooling structure design - Reaches the heatsink mount, cooling the processor and memory. CNC machine tool processing precision, precise process and accurate hole position, sandblasting anodizing process. Aluminum alloy housing COLOR: Silver Size: 5.6 * approx. 8.7 * 1.87 cm / 3.43 * 2.2 * 0.74 inches Ultra-thin design Easy to install Fast heat dissipation Material made of smooth and straight aluminum All ports and slots on the case fit perfectly with the Raspberry Pi 4 Model B Open case design, no need to worry about it affecting the WiFi signal Reinforced aluminum material, lightweight and durable, stainless steel Package contents: 1 * Housing kit 1 * Wrench 1 * Pack of screws Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowable measurement error is +/- 1-3cm.