100% Polyester & Light Filtering These Roman shades don't require any drilling for installation. They have a cordless system where you just pull to adjust and release to lock in place. You can easily set them at any height you want - perfect for controlling sunlight, creating your ideal room decor. light filtering performance, penetrates part of the sunlight, isolates strong light, protects the home and eyes in the family from strong light, while safeguarding the indoor light sufficiently. These Roman shades are our latest upgraded design with a built-in support bar at the back. It solves that annoying problem where regular Roman shades made from softer fabrics tend to sag or won't hold their position properly. The reinforcement not only makes the shades more durable for long-term use, but also gives you perfect control when raising and lowering them - super user-friendly Versatile application, Suitable for various rooms and spaces such as living rooms, bedrooms, and offices, providing a comfortable and practical window treatment solution.If you don't know how to choose a size, check out the measurement guide in the 9th picture from the main image or contact me via Amazon mail! No Drill No Tools Roman Blinds for Windows