A clean box is composed of a box body having an opening in one surface thereof and a lid member for closing the opening. In the magnetic display, black color that is a color inherently exhibited by magnetic particles to be provided as indispensable character, and image-forming elements is converted into a wide variety of colors without using any coloring material or the like. The operation of the electronic wheel unit and the defined energy consumption of the electronic wheel unit is controlled in accordance with the data that has been recorded by the condition recording unit andor the energy recording unit using a central control unit that is connected to the condition recording unit andor the energy recording unit. The Ni provides a strong negative magnetostriction that sets the moment of the magnetic layer in a desired direction parallel with the ABS while the NiFe layers at either side of the Ni provide good antiparallel coupling properties, allowing the magnetic layer to be antiparallel coupled with adjacent magnetic layers of the in stack bias structure.