listing for 1 item. The Arch Window Shade Blackout Cellular Shades by Maritown are custom-made to fit half-circle windows with a height of 36 inches and a width of 72 inches. These shades come in a sleek black color that can block out light completely, perfect for privacy and darkening a room during the day. With double-sided tape mounting, these shades are easy to install and provide a stylish and functional addition to any home decor.