These cables are the male to male cables required for connection from your PC to the Gecko G540. Male to Male parallel port cables are very hard to find locally, so we are offering these cables. In addition, these cables are straight pass through, meaning the pin number on one side is match to the pin on another side. The 10 foot length gives you plenty of flexibility to mount your PC wherever you want relative to your motor control box. A perfect compliment to our 3 and 4 axis kits.