This precision metal heatsink case is so well made; it really needs to be marvelled at. It consists of two machined halves, one 1/2 fitted with two tiny heat extraction fans. Metal pads (part of the upper fan heatsink) are meant to touch the top of the processors to draw heat directly from them via thermal pads supplied. There is no better way to do this. The fans draw heat away from the pads. The Raspberry Pi 4 can run hot at high processing speeds and this unit is the ideal way to fix this. The Pi 4 basically clamps inside the heatsink, leaving all connections free to connect to the outside world. Basically is the same foot print of the Pi 4. Colour : Black Length : 100mm Width : 75mm Height : 35mm Weight : 100g Packaged Volume : 0.25l Packaged Weight : 0.12kg Packaged Length : 10cm Packaged Width : 6.6cm Packaged Height : 3.8cm Ventilation Holes : true Make of outer material : Aluminimum