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These 4-pin PWM fan extension cords lengthen the original fan wires conveniently for neat internal cable management. The complete PWM signal pass-through design does not affect automatic speed adjustment via motherboard BIOS or fan control software. The fixed 27cm length adapts to various mid-tower and full-tower PC cases. Supplied in a set of 10 pieces, they are ideal for DIY PC builders, system integrators and repair stores for batch assembly and fan relocation upgrades.