Use these cables to organize your custom PC system. They will help organize connections when using several PC cooling fans in your rig. The dual fan splitter connects 2 fans with a single motherboard 3pin or 4 pin PWM hub header. The darkside cables are custom sleeved in black for 3 pin and 4 pin PWM Desktop PC and Computer cooling fans. They can also help when you need to extend PC cooling fan connections to motherboard headers, fan controller or PWM fan hub in cases by Antec, Case Labs, Corsair, Fractal Design, Inwin, NZXT, Phanteks, and Thermaltake.