Matthews manufactures 6.10 m x 6.10 m (20' x 20') Overheads with the best fabric available on the market today. Consult our fabric specifications page for a quick overview of what each fabric is useful for. Matthews' 6.10 m x 6.10 m (20' x 20') are sized according to the industry standard approximate measurement of 5.94 m x 5.94 m (19'6" x 19'6"). All fabrics are tested in a dark room with an incandescent light source at one end and the fabric positioned at 2/3 of the distance between the source and the digital photometer.