Description: brand new and high quality Feature: 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. Excellent performance and the cooling effect is more obvious. 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. Various sizes optional to meet your different needs. Easy and conveneint to install and remove. Tear off the blue sticker before use. It is suiatble for PC computer, laptops, notebooks and hard disk to dissipate to extend their life for time. Specifications: Item Type: Heatsink Material: Graphene Size: 67x18x1.5mm/2.6x0.7x0.05in, 67x18x2mm/2.6x0.7x0.07in, 67x18x2.5mm/2.6x0.7x0.09in, 67x18x3mm/2.6x0.7x0.11in, 67x18x4mm/2.6x0.7x0.15in, 67x18x6mm/2.6x0.7x0.23in(Optional) Color: Black Quantity: 1 Pc Note: No retail package. Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x Heatsink