REAL Blackout Shades: 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. Cordless Blinds for Windows: The built-in robust constant force spring mechanism has passed more than 5,000 times usual lifting or pulling down testsand makes it easy to raise and lower the blind evenly every time and stay balanced automaticall. It will stay at whatever position you stop. The bottom aluminum rail is weighted to hang flat and prevent from wind blowing. No tangled cords, safer for child and pets. 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. Custom 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. 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. LazBlinds Cordless Cellular Shades, Blackout Room Darkening Custom Cut to Size Honeycomb Shades Pleated Blinds for Windows, Black