Designed for medium to large lens and camera combinations, the Pro Ball Head by FlexShooter features a patented double ball system, which unites three functions in one device. The inner ball operates as a two-axis head nestled inside the outer ball, which provides leveling and panning. The weight of the camera is balanced by the only spring-balanced ball head design in the world. The patented spring balance design is incorporated in both balls for a gimbal-like range of movement without the risk of lens flop. Each ball provides tension and locks individually for precision control of your lens movement.