Product length: 35cm. conductor material: copper. DC5521 to 4 Pin Cable: 5.5mm x 2.1mm dc to fan adapter cable is suitable for 3-pin and 4-pin case fans. 2 x DC to 3 Pin/4 Pin PC Fan Cable. Quality Material: The inside of the cable is made of high-quality copper wire, which has good conductivity and can be stably connected to the device.