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Daystar Poly Flex joints are the answer for anyone that needs a strong and silent pivot point. Like a traditional Heim joint the Poly Flex joint utilizes a spherical ball captured inside a steel outer shell. Unlike Heim joints, however Poly Flex Joints encapsulate the spherical ball in a special blend of polyurethane. Housed in a steel outer shell the joint allows a greater range of movement without binding in its attachment points.