Mob Wire

Mob Wire would be used to keep mob spawners outside of a certain perimeter. It would kind of be like red stone but would be black. It should be semihard to craft. Instead of having to completely light up the area you would be able to use mob wire to keep mob spawners from spawning inside a certain perimeter. For instance lets say we made a square around a house on (Y 200) and (Y 600) that would keep all mob spawners outside that area and between.