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Daystar™ Poly Flex Control Arms are designed for Jeep enthusiasts by Jeep enthusiasts. Constructed from heavy-gauge tubing, these arms use a combination of Daystar's Poly Flex Joints and Poly Joints to maximize suspension travel and articulation. Poly Flex Joints are specially designed joints that feature a spherical ball encased in a special blend of polyurethane. Housed in a steel outer shell, the joint allows the arms a greater range of control arm movement without binding in its attachment points.