NB series heads use a non-spherical elliptic ball and built-in hydraulic damping design and hold many advantages of the world top heads,as well as followings: A,Simple operation. B.Self-balanceable upon the camera weight,effectively preventing instantaneous fall-off. C.Fitted with a scale of 360 degree,suitable for high standard film receipt. D.Very lubricated and smooth,as soft as silk,withour the sense of stop.