The Miro Brand 36" x 64" Light Filtering Cellular Window Shade, Cordless, Trimmable (White) The 36-inch by 64-inch cordless cellular light filtering window shade can be cut up to 18-inches; 9-inches on each side Constructed from high quality non-woven polyester fabric that gently filters in natural light while also providing a high level of insulation to keep out summer heat and winter cold Features a unique durable spring tension device located inside the bottom rail for cordless operation; to operate simply press the button located on the bottom rail and pull or push Utility knife and sizing tool included Cell Size: 9/16 inches