Ferret-badgers are, of course, neither ferrets nor badgers, but entirely their own group. As the English name implies, they have features some way between the two animals for which they are named, although they are distinct in a number of ways, too. Their total body length is not far off that of a ferret, but they have the stocky build of a badger, and so somewhat resemble a smaller, slimmer, version of that animal. Proportionally, though, their tail is longer than that of a badger, and they have a narrower, more pointed snout. They have greyish or brownish fur over most of the body, which, again, looks quite badger-like, and black-and-white markings on the face.
However, these markings are not the clear stripes of a badger, although they aren't really the 'mask' pattern found on ferrets, either. One distinctive feature of the markings is a white stripe running from the forehead down over at least the neck, and often further down the middle of the back. American badgers have something similar, but it's often more striking in the ferret-badgers. Like many other members of the weasel family, the creatures are said to have a strong odour, and they're also quite fierce, so it could be that the highly visible markings serve as a warning to other animals.