Tab-Tensioned, Draper's Tab Tensioning System for vinyl surfaces. These screen surfaces consist of a reflective vinyl with no textile backing, and are tensioned for sufficient flatness to perform properly.  The surface is stretched flat, resulting in better picture quality.

Non-Tensioned, sometimes referred to as free hanging or conventional. The reflective surface is laminated to a woven textile base.  The screen surface hangs suitably flat because of the stability of the material and the weight of the bottom dowel.