IKEA FRAMFUSIG single track rail with gliders

This set makes hanging curtains a bit easier. It comprises all the parts you need including a telescopic rail so you can get the length just right, without having to cut or saw. A complete curtain rail set including telescopic rail that can be adjusted to your desired length (100-180 cm).

You can avoid having a gap between the curtain and ceiling since the rail is ceiling-mounted.