How to choose a Proper Size: INSIDE MOUNT: Choose the size SAME or CLOSEST to the window width. For Example, if your windows are 30" wide, order 30" or slightly less for internal installation. OUTSIDE MOUNT: to make sure to cover the entire window, outside mount shades need to be 4 inches wider than windows wide. For Example, if your windows width is 30", order size 34" would be okay for outside mount. Blinds height can adjust from 0" to 60". Light Filtering: Blinds are made of 100% natural bamboo materials, small gaps between each flat slat are normal and help gently filter light for a unique, soft glow in a natural wa, perfect for living room, dining room, office. Cordless Blinds for Windows: The cord-free design provides a clean, tangle-free look to the window and creates a safer environment for children and pets. Easy to raise up or lower down to gently filter sunlight. Easy to Install. Natural high-quality wild bamboo, breathable, keep the indoor air fresh, warm and beautiful. Please understand actual item may vary in color from computer monitors colors. Due to the nature of real bamboo, shades are for indoor use, and not for outdoor use or moist, damp environments. (Pls Note) For INSIDE mount, window frame should have at least 2 1/2” depth. We provide customized size services. If you have any issues or questions in the process of purchasing, installing or using, please feel free to email to us by Amazon message and we will respond to you within 24 hours.