Precise design for Raspberry Pi 4 Model B, CNC precise cutting, remain all interface and ports.     Made by aluminum alloy, provide better protection, and it is 17 mm ultra thin thickness.     The aluminum case can provide a good passive cooling for the Raspberry Pi, so you need not worry about the over heating. Also provide the heat sinks, for better heat dissipation     Access to all ports of for Raspberry Pi 4 Model B computer,for raspberry pi 4 passive cooling case with better heat dissaption     The heat conduction column design on the back of the upper cover of the shell conducts the heat of the chip to the whole shell through the thermal conductive silica gel     Use for: Raspberry Pi 4 Model B     size:93x62x17MM      Material:Aluminum alloy     colour:Black          Package Contents:     1 * Upper Cover     1 * Lower Bottom Plate     4 * Slip Sticker     1 * Logo Sticker     2 * Thermal Grease     1 * Inner Hexagon     4 * Screw     4 * Single Pass Copper Pillar     1 * Acrylic Gasket     1 * Aluminum Single Fan     /     1 * Upper Cover     1 * Lower Bottom Plate     4 * Slip Sticker     1 * Logo Sticker     2 * Thermal Grease     1 * Inner Hexagon     4 * Screw     4 * Single Pass Copper Pillar     1 * Acrylic Gasket          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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.