Graphene is the most efficient heat conductor in the world,Its thermal conductivity can reach 5300W/mK, pure copper only 386.4W/mK and aluminum only 237 2W/mK. You can use the temperature software to test the temperature before and after installation, you find that it is more efficient than other radiators. When the computer temperature , the computer crash less and run more smoothly and more . Two types: chute and grid pattern design, increase the heating cooling area. The bottom polishing technology is seamless and leave no . It is suiatble for PC computer, laptops, and hard disk to dissipate to extend their life time. Comes with the silicone thermal pad and rubber band, has an excellent performance and the cooling effect is more obvious. Easy and conveneint to install and remove. Item Type:Heatsink Size:70x20mm/2.7x0.7in Thickness:2mm/0.07in Colour:As Shown Material:Pure Copper+Graphene Coating Package Contents: 1 x Heatsink 1 x Thermal Pad 3 x Rubber Ban Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.