Features: 100% brand new and high quality There are two materials of heatsinks: pure copper and aluminum alloy , good thermal conductivity offer good passive cooling for Orange Pi 4 Lts . Each heat sink has self stick thermal conductive adhesive , you can stick them to Orange Pi directly. 5 piece of heat sink can provide cooling for both CPU ,USB control module and nerwork module. Passive cooling architecture design can reach perfect heat dissipation. 5 pieces set heat sinks on PCB board for better heat dissipation.. Package Includes: 5 PCS x Copper Heat Sinks ( not include Raspberry Pi) Specifications: Material: Copper+Aluminum Alloy Color: As Pictures (Golden , Black) Compatible with: Orange Pi 4 Lts Size: approx Standard Paste material : Thermal conductivity of silica gel quantity: 5PCS/ 1 Set note: Note: Orange Pi 4 Lts 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