This was just what I was looking for.  My husband was not happy with my request to hang the curtain rod above and beyond the window frame.  He feared that over time opening and closing the drapes would pull the hardware out since it wasn't attached to stud.  I switched from using the pocket on the curtains to using these clips.  Now the curtains slide with ease.  I used 9 per curtain panel, they are lightweight and lined.