Exteral Size: 100x50x15mm/ 3.94x1.97x0.59 inches (L x W x H) Bottom Thickness: 3.5mm / Copper Fin Thickness: 0.5mm Processing Method:Skiving fin / Finishing:Antioxidant treatment / Weight: 250g +/- 20g Used for Electronic,LED,CHIP computer 's component heat dissipation, or anywhere you need a efficient heatsink. This Heatsink is made of pure copper, and the thermal conductivity up to 401W/(m K) ,is high quality and effective heatsink. Colour: as shown Material: copper Package Contents: 1 * Pure Copper Heatsink Only the above package content, other products are not included. Note: Light 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.