... used the PVC plug-in unit, no need sewing, easy for installation.Low friction factor between the beads, not easy to damage ... alloy steel material.Elaborately gear wheel design, more smooth for operation and controlling.The fittings are delt with ultraviolet and ... resistant, no friability and no deformation.Control mode: Manual for beads.Suitable for awning of family, hotel, villa, meeting room, coffee ...