Think of this as the connective tissue of a cat wall. At nine inches it is just big enough for a confident paw and a quick push off, moving your cat from one piece of furniture to the next without a floor-standing tower in the way. Plenty of cats also decide it makes a fine little perch and settle in for a while.You can mount one on its own or string several together to build a proper climbing path, and there is a set of three that makes that cheaper to do. Each shelf anchors into a single stud, so placement stays flexible even on an awkward wall.