This is a USB 2.0 type B to Mini-B 5-pin black cable. You know, the mini-B connector that usually comes with USB Hubs, Cameras, MP3 players, etc. We specifically like these 6" long cables because using USB peripherals in projects within a small enclosure is much easier these days, and most times you really don't need six feet of cable to do that. You can still use this USB cable with our SparkFun RedBoards, FTDI Basics, ProtoSnap, or anything else that utilizes a Mini-B connector type!
If you're still trying to wrap your head around the world of USB cables, why not check out our USB Buying Guide?