They are precision one-way joints made up of two rings , a driving one that pulls and a driven one that is pulled. The motion is transmitted in one direction only and when the two rings engage the transmission of torque occurs, while when the rotation of one goes in the opposite direction the release occurs and free rotation occurs. The material they are made of is steel with tempering treatment and they can be rollers or asymmetric contact bodies . They exist in a version to be centered or already self-centering equipped with ball bearings or bronze bushings . CTS is able to satisfy the most particular needs by building special freewheels to design or by modifying standard products. CTS technicians are also available to verify the correct use of freewheels in your projects and to resolve your problems.