A simple and scalable drawing-drying process for spinning pure double walled carbon nanotube (DWNT) fibers out of DWNT cotton is reported (see figure). Fibers with lengths up to tens of centimeters can be spun, and these fibers possess high mechanical strength. Field emission and electrochemical tests performed on individual DWNT fibers reveal the possibility of using the DWNT fibers as components in various device architectures.