|An Activator is ideal when manual manipulation is not possible or desirable. The ACTIVATOR IV features a complete range of force settings 1 to 4 that allows you to effectively treat a patient. The new lighter preload spring is perfect for use on the more tender areas of the body. The new number one setting is perfect for treating, cervicals, TMJ, children, and small body frames. Includes rubber tip. Available in Activator IV and Activator IV EZ models. See EZ model entry.