This product is a Raspberry Pi 4B pure copper heat sink, which consists of a vest-shaped heat sink and an acrylic bottom shell, with a matching silicone pad and screw bag. Better heat dissipation while protecting the motherboard. Copper dissipates heat better than aluminum because copper has a thermal conductivity of 401 (W/mK) and aluminum has a thermal conductivity of 237 (W/mK). Copper is a purple-red luster metal, it has good ductility, and has good thermal and electrical conductivity. Aluminum also has good electrical and thermal conductivity, and also has high reflectivity and oxidation resistance, but compared with the two, copper is slightly better in terms of heat dissipation effect.