RIG-I-FLEX® is a versatile I-beam track which has been engineered for both curved (Model 140) and straight (Model 141) cord traverses as well as for "walk-along" (Model 142). It was designed for medium weight curtains on stages and TV studios and for enclosing areas in industrial plants. Overall track length should not exceed 60 feet. Model 140 utilizes spindles and idler brackets for guiding the operating cord along curved areas. Manually operated cord-drawn curved tracks require more effort than straight tracks. Therefore, motorized systems should be used, especially where sharp curves are involved. The track is curved on the job or at the factory (at additional cost) to a minimum radius of 2 feet. Uses 1 carrier per foot.