The micro whip allows the user to adjust focus remotely significantly reducing the risk of vibration being picked by the camera. * It is made of the material as heat-shrink tube and plastic,strong enough and touch good.It is with standard 12mmx12mm port,which make it also able to work with other brand follow focus in hand. * Safety-lock design at the end of termination,which ensure it not fall off the follow focus. * Various size for option:3" 10" 12" 15" 18" (This one is 10"") * Package including:Fotga DP3000 standard 10"" whip speed crank for follow focus x 1