Polyester Custom Cut to Size: Each blinds will be customzied according to your exact window size, and can't be sold after a return. We appreciate customer's precise measures & careful orders, and avoid returns without quality issues. Please provide us with your window size directly without any calculations. We'll double-confirm the size with you via email for a worry-free ordering experience. No Drill Blinds: LazBlinds patented technology No Tools-No Drill system allow it no need to drill any holes on your window frame, great for Renter, Landlord, and Home Buyer. Easy to Install in 30 seconds. Fit All Kinds of Walls, like woodiness metope, tile marble, concrete wall and rough tile. Blackout Window Blinds: The silver-plated layer inside the cell can completely keep out the sunlight and uv ray. Offering a real dark environment, bringing you a good night's sleep during the day. Perfect for bedroom. All honeycomb fabrics have a white backing to reflect even more daylight and provides a uniform appearance from the outside. Sound & Heat Insulation: The unique honeycomb structure creates air pockets to provide insulation by trapping air in the cells to block harsh sunlight and UV. It also works well in noise reduction and privacy protection, so as to provide you with a comfortable space. Lead Time and Service: We need a week to produce and transport after the order confirmation. Please keep checking and responding to your Amazon messages until your order information is confirmed. Please feel free email to us by Amazon message if you have any questions and we will respond to you within 24 hours.