There are different types of clips, but the main difference is a driven or an idler clip. A driven clip has the secondary part, a permanent magnet system, on its top and bottom side. The driven clips applying the stretching force (MD and TD direction) on the film, caused by the longitudinal magnet wave of the linear motor. The idler clips applying a stretching force only in TD direction, no permanent magnet system is mounted. On the idler clip the brake plate of the idler brake is mounted.