Devices commonly used for correction of Class II malocclusions can be classified as extra-oral (headgear), intra-arch or inter-arch. The intra-arch devices are either removable (Cetlin or sagittal appliance) or fixed appliances (Distal-jet, Jones-jig, etc). Fixed intra-arch appliances often depend on a Nance button for anchorage. Interarch devices, which use the mandibular arch for anchorage, can be removable or fixed. They can pull (Class II elastics) or push (Frankel, Herbst, Japer jumper). The Forsus Fatigue resistant device is an inter-arch push spring that produces 200g of force when fully compressed, the force levels being comparable to heavy Class II elastics. The Forsus FRD has be effective in correcting Class II division 1 malocclusions without the need for patient compliance and considerably reducing chair-side time. The optimum force levels increase patient comfort and provides faster resolution of Class II skeletal base maxillo-mandibular relationship.