Features:_x000D_ _x000D_ Ultra thin design,easy to install,quick heat dissipation. _x000D_ Smooth straight aluminum material and double fan design for better heat dissipation performance. _x000D_ All port and slots in the case are perfectly fit for Raspberry Pi 4 Model B / B +. _x000D_ Open design, no effect to WIFI signal,more stable wireless transmission. _x000D_ Reinforced aluminum, lightweight, durable and reliable. _x000D_ _x000D_ Specification:_x000D_ Item Type:Case _x000D_ Material:Aluminum Alloy_x000D_ Size:Standard Size_x000D_ Color:Black_x000D_ Fitment :Fit for Raspberry Pi 4 Model B / B +_x000D_ _x000D_ Package List:_x000D_ 2 x Black Case_x000D_ 2 x Fan_x000D_ 1 x Wrench_x000D_ 12 x Screw_x000D_ 3 x Glue Paste 1Ultra thin design,easy to install,quick heat dissipation. 2Smooth straight aluminum material and double fan design for better heat dissipation performance. 3Open design, no effect to WIFI signal,more stable wireless transmission. 4All port and slots in the case are perfectly fit for Raspberry Pi 4 Model B / B +. 5Reinforced aluminum, lightweight, durable and reliable.