The Cell Honeycomb Shade is not only stylish but functional as well. The unique hexigonal shape of the honeycomb design acts as an insulator; trapping hot and cold air. 100% polyester with vinyl tops and bottom rails. Inside or Outside mount. Windows must be at least 1-3/8"D for inside mount; 2 1/4"D for outside mount. Hardware and instructions included. Imported from Taiwan.