Features: There are two materials of heatsinks: pure copper and aluminum for optional, good thermal conductivity offer good passive cooling for Orange Pi 5 development board . Each heat sink has self-stick thermal conductive adhesive , you can stick them to Orange Pi directly. 4piece of heat sink can provide cooling for both CPU ,USB control module and nerwork module. Passive cooling architecture design- can reach perfect heat dissipation. 4pieces set heat sinks on PCB board for better heat dissipation.. Specifications: Material: Copper/ Aluminum Color: As Pictures for: Orange Pi 5 Size: approx Standard quantity: 4PCS/ 1 Set Note: Note: Orange Pi 5 board is not included. Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment Package includes: 4 PCS Copper Heat Sinks