This Item is compatible with Electric / Manual Roller Background System FEATURES - Diameter: 4.8cm / 1.9" - Metal tube designed to hold backgrounds up to 13 feet wide - Each tube composed of 3 interlocking sections - Makes raising and lowering your backgrounds quick and easy - Perfect for muslin, paper, computer-printed and canvas backgrounds CONTAINS - 1 x 13ft 4-section Metal Tube/Crossbar for Roller Background System