This plastic PVC is supplied straight but is both flexible and bendable to fit any window shape.The track bends by hand due to it flexibility. The user friendly system makes installation quick and easy. The track can cut to size with ease. The supports are key lock and do not require additional tools to fix to the track, they can be either ceiling or wall mounted.The hook and glider design allows for the curtain to be directly hooked onto the glider and hide the track, or with use of curtains hooks the curtain can be hung below the track. Alternatively, you can hang a curtain to the glider and a loose curtain lining via the use of a curtain hook to hang it below the track.