Starflex has a simple construction of two hubs with one element inside. There are 2 kinds of elements that are different in hardness, selectable according to misalignment and torque response. The material of element is Polyurethane Elastomer, that realized 2 times of torque comparing with our present jaw type coupling. No backlash is possible due to the pre-pressured design of element and hub. The hub is made of aluminum alloy, which has two types of connection, clump type or key type. Starflex passed our Green design criteria and adopts to RoHS instructive.