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1. Size: 1.97"(L)x1.97"(W)x0.78"(T)/ 50mmx50mmx20mm. 2. Weight: 15 oz / 61gram per, 14 fins per, flatter base plate and tick enough base material. 3. 6063-T5 aluminum and anodized heat sinks improved version, not easy to be scratched, the fins are not easy to bend; made of high quality aluminum, better thermal conductivity. 4. This 50 mm square aluminum high power fan heat sinks cooling heat transfer block kit is suitable for cooling electronic, computer, electrical facilities, play a cooling effect passive cooling of LED high power electronics voltage regulators peltier plate module semiconductor refrigeration tablets etc. Heat dissipation device, great function for heat dissipation reduces CPU and LAN. 5. Includes 4 pieces 50mm heat sinks.