Materials: Aluminum Color: Black(2PCS) Aluminum Heatsink Size: 5.9 x 2.91 x 0.39 inch / 150 x 74 x 10mm (L*W*H) Weight : 125g/Pcs Base board thickness:2 mm, Fins board thickness:2mm Used for: Various mini DC converter circuit board, LED, Power IC, Transistor etc. Pure aluminum heat sink, which is suitable for electronic, computer, electrical facilities, Widely used in power transistors, FETs, ICs, power amplifiers, voltage regulators, MOSFETs, SCRs, etc Heat sinks are used with high-power semiconductor devices such as power transistors and optoelectronics such as light emitting diodes (LEDs), where the heat dissipation ability of the component itself is insufficient to moderate its temperature.