DFRobot Raspberry Pi Single Cooling Fan Kit is a one-fan Raspberry Pi radiator compatible with Raspberry Pi 3B/3B+/4B. The heat sink is made of high-quality aluminum, and the surface is designed with slots. This is more conducive to heat dissipation. One 7mm 9-blade cooling fan is installed on the aluminum heat sink. The heat sink comes with adhesive backing for easy installation.