You can utilize these 4 pin PWM fan cables to organize your custom PC system. They're great when using several 4 pin PWM cooling fans in your rig. The dual fan 4 pin pwm splitter connects 2 fans with a single motherboard 4 pin hub header. Darkside 4 pin pwm cables are sleeved and heat shrinked in black for 4 pin computer cooling fans. They can also help when you need to extend PC cooling pwm fan headers, pwm fan controller or the pwm fan hub in cases that include Antec, Bitfenix, Case Labs, Corsair, Fractal Design, Inwin, NZXT, Phanteks, and Thermaltake.