Blackout and thermal insulation: the silver coating and the black blackout surface of the blackout roller blind can effectively block sunlight and UV rays and reduce heat in the room. They provide strong blackout and privacy protection, create a pleasant dark sleeping environment and improve sleep quality . No drilling: comes with 26 pieces of nano tape, which can be removed without leaving any residue and can be used better than suction cups. Ensures that the blackout fabric stays on the window for a long time and can also be removed and glued to other windows that require darkening. If the tape loses its adhesive strength after repeated use, it can be replaced with a new one. Wide range of applications: 4 sizes extra large roof window blackout can be cut freely. It can be used at home, hotels, offices or even caravans. Blackout fabric sold by the metre suitable for any size and shape of windows. Lightweight portable and ready to use, no drilling required, thick Oxford fabric blackout blinds are a better choice than blackout films.