The Ultimate Slider Bundle from Rhino Camera Gear includes the 42" stainless steel Slider Pro, ARC II 4-axis motorized head, Rhino Focus for ARC II, and high-speed and high-torque motors. It also includes interchangeable 24" carbon fiber rails for better mobility where applicable, and a hard carry case with designated compartments for the entire bundle. The ARC II is a highly advanced motorized pan and tilt device. With the slider, slider motors, ARC II, and Rhino Focus, you get a sophisticated 4-axis setup that lets you keyframe motion and rack focus. The high-speed slider motor is designed for horizontal slides while the high-torque motor is for incline and vertical shots.