The Filigrano Ball Tension Rod is a practical and delicate way to easily adjust your sheer curtains to the right light. Since installation requires no drilling or screws, it is ideal for rental apartments. To install, simply extend the tension rod to the desired length plus about 3 cm, then compress it to clamp the curtain rod into the window frame. To remove, just compress it again and take it out. Installation is also easily possible in slanted window frames.