Welcome to icepc.Product Features: Graphene is the most efficient heat conductor in the world，Its thermal conductivity can reach 5300W/m·K, pure copper only 386.4W/m·K and aluminum only 237 2W/m·K. You can use the temperature software to test the temperature before and after installation， you will find that it is more efficient than other radiators. When the computer temperature drops, the computer will crash less and run more smoothly and more durable. Type: Chute design, increase the heating cooling area. The bottom polishing technology is seamless and will leave no gap. It is suiatble for PC computer, laptops, notebooks and hard disk to dissipate to extend their life time. Easy and conveneint to install and remove. Product Specifications: Item Type: Heatsink Material: Graphene Coating&Pure Copper Size: 70x20mm/2.7x0.7in (Approx.) Thickness: 1.5mm/0.05(Approx.) (Suitable for laptop computers and other small space)4.0mm/0.16(Approx.)（More heat exchange area brings better heat dissipation performance, suitable for desktop computers with enough space）Color: Black Type: Chute PatternQuantity: 1 SetPackage Included(No retail package) : 1 x Heatsink