One of the primary components of a coiled tubing unit, the injector head is made up of a chain and gripper assembly to maintain control over the coiled tubing string. Most modern injectors have a hydraulic drive system that provides the tractive effort for running and retrieving the string from the wellbore. The base of the injector head is secured to the wellhead pressure-control equipment by the stripper assembly mounting system. A gooseneck mounted on top of the injector head feeds the tubing string from the reel around a controlled radius into the injector head.