"The Series 200 Lace and Grommet Frame is constructed of 2"" diameter aluminum tubing and is available with a 6"" wide Pro-Trim masking cover that conceals the screen binding and lacing cord. Pro-Trim is a fabric covering that aesthetically enhances the appearance of the installation while absorbing ambient light that surrounds the viewing area. The Series 200 frame is recommended for use with any of Da-Lite's front projection screen surfaces in sizes up to 30' wide and rear projection surfaces up to 20' wide, making it an excellent choice for auditoriums, theaters and other large venues."