This is a Matthews 8 x 8 ft sewn Hi Lights Mylar Butterfly/Overhead, to fit any Matthews, or other brand or make frame. 8 x 8 ft Butterflies measure approximately 7.8 x 7.8 ft.
Matthews fabrics are tested for even light distribution in a black chamber with an incandescent light source at one end and the fabric positioned 2/3 of the way between the source and the digital light meter.
For minimal softening of sunlight, or studio fixture output. It has a density similar to a shower curtain.