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RL-093B RELIFE 50PCS 0.3mm CPU Copper Slice Radiator For Cooling Multi-specifications Can Be Selected Pure Copper Heat Sink. Product Type: The RL-093B is a chip heat sink copper sheet designed for cooling CPUs and other integrated circuits. Brand: It is part of the RELIFE RL-093 series, a line of copper heat sinks. Thickness: The "B" in RL-093B specifically indicates a thickness of 0.3mm, offering a balance between durability and thermal conductivity for efficient heat dissipation. Purpose: These copper slices are used to quickly and evenly transfer heat away from chips, improving overall cooling performance and protecting components from overheating.