An electrostatic image developing toner is disclosed. The first architectural mesh defines a first shading characteristic that is different from a second shading characteristic defined by the second architectural mesh. The supports not only supplement the mechanical strength of the winding but also define channels for the flow of coolant to extract heat from the coils. It is fixed in its final position by connecting the holder to a transverse line holder as a function element by means of an expansion pin or other connection elements.