Features: 1.Metal double fan housing for Raspberry Pi 2nd generation / 3b/3b. 2.All-body aluminum alloy: The surface is easy to produce a dense and firm protective film, which can protect the substrate from corrosion, light and durable, wear resistance and rust resistance. 3.Ultra-thin design, easy to install, built-in thermal column, fast heat dissipation, all ports and slots of the case are suitable for Raspberry .Pi 3B/3B, reinforced aluminum material, lightweight and durable, open design ensures that our shell does not affect WIFI signal. Specification: Model: Three generations of metal Chassis style: rectangular Compatible motherboard: three generations Material: fine aluminum alloy Package List: 1 x Upper aluminum alloy casing 1 x Lower aluminum alloy casing 1 x Dual cooling fan 1 x Hex wrench 4 x Thermal silica gel 12 x Hexagon screw