Wish you have a pleasant shopping in C9D's shop ! Features: 1.Provide 6 kinds of thickness (0.3/0.5/0.8/1.0/1.2/1.5MM) for you to choose. 2.Thermal conductivity is up to 401 w/mk, very nearly silver's thermal conductivity 409 w/mk, much higher than ordinary copper pad (20-30w/mk) 3.Exposed to the air, the copper will inevitably oxidize and turn dark, but the cooling effect does not be affected. Copper Pads Included: This copper heatsink comes with 1mm copper shims and thermal pads for GPU, making installation easy and hassle-free. High Performance Thermal pad with Phase Change Material | Durable, not electrically Conductive | for CPU, GPU & Electronics Cooling Package included: 20 pcs Thermal Conductive Copper Shims 15mm x 15mm x 1., 0mm 25pcs 20mm*20mm*1.0mm Thermal Pad GPU CPU Heatsink Cooling Conductive Silicone Pad-in Fans... Heat Sink Compound Pxyelec High Purity 15 X15 X 1.0mm Laptop GPU CPU Heatsink Thermal... Gpu Thermal Pads 4., 5 out of 5 stars Best Sellers Rank #470 in Heatsinks Date First Available October 24, 2014 High Purity Copper Heatsink: This 15mm x 15mm x 1., 0mm copper shim guarantees excellent heat dissipation for your laptop's CPU and GPU graphics card. If you still worry about it, you can polish the of this copper shim by fine sandpaper or toothpaste. 4.Can solve laptop frequent crashes and other problems caused by thermal conductivity. 5.Can be applied to the desktop computer north and south bridge connection, graphics card thermal conduction. 10pcs Pure Copper Heat Sink Sheet Radiator For Computer CPU 15x15x1.0mm And this copper heat sink solve thermal problems caused by frequent crashes laptop, etc Thermal Conductivity: With a thermal conductivity of 401w/mk, our heatsinks outperform regular copper (20-30w/mk) and provide superior cooling performance.