Mass Mesher Device MMD-XX It is easier to hide behind something than to completely disappear. The MMD is actually a reversed engineered and refined version of the NRM's Dark Demon C-1 Cloaking device. Mass Meshers are renowned for being able to conceal a craft by meshing EM signatures to nearby surfaces or any object significantly larger or heavier than it. These valued vary depending on the mass and size of the craft equipped, and the power of the MMD system on board.