VELUMPIA LINEX Roller Shade Systems; weighted winding shade systems. In the rope series of the model, the hem-bar at the end moves on the guide ropes on both sides of the curtain. In the channel profile series of the model, the hem-bar moves in the rail channels on both sides of the curtain. With these features, it is ensured that the curtain stands upright in windy weather, while at the same time it is ensured that the fabric has a more tense appearance.