LinuxFreak brand Aluminum Heatsink set for Raspberry Pi - Set of 2 Heat Sinks Lightweight aluminum heatsinks with adhesive backing strip to stick firm Increases cooling of any small RAM / GPU / CPU / Southbridge etc.. Comes pre-fit with thermally-conductive adhesive for excellent cooling performance and ease-of-installation. Cross-cut fin design offers improved airflow and surface area over plain flat-fin coolers.