The vast majority of the connectors available on the market designed for static, i.e. in conditions where you can damage the two connected elements on any large displacement. However, in some cases, this limitation is of particular importance, which makes impossible the use of classical connectors. A good example is any mechanism, for example, the shoulders of the robot however, in some cases, you can effectively lead wires (with the stock) outdoors or near a joint, but what in the case when the element should have the possibility of unlimited rotation of 360 degrees? Then come to help the connectors slide.