Matthews manufactures 6.1 m x 6.1 m (20' x 20') overhead reflectors using the finest fabrics available on the market today. See our fabric specifications page for a quick overview of what each fabric is useful for. Matthews 6.1 m x 6.1 m (20' x 20') reflectors are sized to the industry standard measurement of approximately 5.94 m x 5.94 m (19'6" x 19'6"). All fabrics are tested in a darkroom with an incandescent light source at one end and the fabric positioned 2/3 of the distance between the source and the digital light meter.