No, it is not an adjustable curtain rod. You can by it by the meter or yard and cut it to the length that you need. It is a something like a coil covered in plastic and it stretches. You insert these little thingies at each end and hook them onto a hook or nail. It is completely flexible and goes around corners, if needed. You cut it a little shorter than the width of your window and then stretch it to make it nice and taught, so your curtains won't sag.
I bought it at Fabricland in Canada. I photographed a sample. Picture below
[/IMG]