The present invention relates to a method for producing 1-hydroxymethyl-1,2-diphenyloxiranes from 2,3-diphenylpropenals by means of epoxidation and reduction. By providing gates at the cut-out portions, the metal plate is insert molded without depending on submarine gates. Elements comprising the display have selective light polarization properties globally determined by direction of the magnetic field each experiences, the primary component of which is that provided by the magnetic field source rotated by the pressure transducer within the vehicle tire.