A hydraulic vibration-damping support comprising two strength members interconnected by an elastomer body which defines a working chamber filled with liquid and separated from an easily-deformable compensation chamber by a rigid partition. Once generated, the printstream is transmitted preferably to a high speed, high volume, printer for producing the printed documents to be included in the mail pieces, such as billing statements. Next, an amorphous silicon having a first region and a second region is formed on the substrate. The invention further provides photochromic materials of specified structure, photochromic compositions, photochromic articles and optical elements that include the photochromic materials.