The production of this valve drive belt begins with a woven / rubber mat which is sewn together in the first stage of obtaining a roll which is then coated on the vulcanization mold with particular tooth profile. In the following steps several layers of rubber material and the tension member are applied and cured together. The pull string (fiberglass) transmits the Hauptzuglast and gives the stability belt. The tension member is a continuous material that has not been assembled and the belt is therefore the tensile strength. The visible on the inside in one place seam is therefore no stability Imaging characteristic.