A junk defense is a defense using elements of both zone and match defenses; the most well-known is the "clam" or "chrome wall". In clam defenses, defenders cover cutting lanes rather than zones of the field or individual players. It is so named because, when played against a vertical stack, it is often disguised by lining up in a traditional person defense and right before play starts, defenders spread out to their zonal positions, forming the shape of an opening clam. The clam can be used by several players on a team while the rest are running a match defense. Typically, a few defenders play match on the throwers while the cutter defenders play as "flats", taking away in cuts by guarding their respective areas, or as the "deep" or "monster", taking away any deep throws.