I've used it for about a year, and I don't think there are any stains or scratches (based on my personal inspection). It's used, but please consider purchasing if you understand this. Thank you. (Excerpt from an internet site) * Material: Aluminum * Product Dimensions: 190cm long x 75cm wide * Brand: Grandekor * Color: Green * Opacity: Dimming * Product Use: Windows * Mounting Type: Screw-on - Ceiling mount, Front mount * Waterproof and Antibacterial: Selected high-quality aluminum. 3-layer structure: anti-oxidation layer, waterproof layer, roll-formed slats; eco-friendly materials that do not cause harm. Waterproof and antibacterial, can be used in bathrooms and kitchens; light blocking and heat insulation; thicker for greater strength.