From Manufacturer
For straight and curved camera movements, set up your camera on the 9.SOLUTIONS Mini C-Pan Arm. One end of the arm mounts to your tripod, while your camera attaches to the other side. The Mini C-Pan's smooth mechanical joints provide a smooth sliding platform. With small adjustments to the arm itself, straight and curved tracking shots can be achieved. If you attach two separately available ball heads, vertical and slanted movements can be accomplished as well.