DR7709 Features: * Each side piece slipfits tightly to injection molded plastic corners, forming perfectly mitered edges * No snaps! Uniform tension is applied to the entire surface area, so the surface is perfectly flat * Unique fabric retention system enables you to adjust the surface tension up to 1-1/2"", both vertically and horizontally in increments of approximately 3/8"" in just seconds, without tools * Warranted for one year against defects in materials and workmanship Color/Finish: * Frame finish: velvety black textile, Vel-Tex, to eliminate reflections