Please note we have discontinued the original 4mm Warpquad 230mm arms. The Helix ZX6 arms are an updated version of the 4mm Warpquad 230mm arms. Since the Helix ZX6 arms are being used in all Warpquad 230mm frame kits with 4mm arms this now allows the option of using Helix ZX6 fairings when using Helix ZX6 arms.