Features: brand new and high quality The copper has good thermal conductivity , can provide good passive cooling for your laptop cpu gpu ic chipset Simple to use, you can use thermal silica stick them to the on cpu surface 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. Good electrical conductivity, corrosion resistance, general strength and hardness, Specifications: Size: approx 1.5x1.5cm/0.59x0.59in Thickness: 0.3mm/ 0.5mm/ 0.8mm/ 1mm / 1.2mm/ 1.5mm/ 2mm (Optional ) Quantity: 5PCS Material: Copper Package Includes: 5PCS x Copper Thermal Pads note: 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