Open-end frame supports are made from spring steel with a 3/8" spigot and bracket that allows the Scrim to be hung from a C stand grip head when not in use. The two vertical frame arms are grooved at both open ends to retain the piano wire woven through the fabric to form the fourth side of the frame without causing shadow. Open ends are used to control or manipulate light falling on certain areas of the set or subject. They can be used to soften or reduce light without creating a visible edge. A coloured border is used around the frame to identify the fabric. Matthews open-end frames are black powder-coated to minimise unwanted reflections.