This is our new RSX level 0 axles, designed to be a stock replacement axle they have a 1117 billet inner housing. 1117 Billet outer c.v. with a single arc cage design (a lasting advantage over stock)the center bar is 4130 chrome molly and is an excellent alternative to stock replacements.The axle is superior over a stock and axle and is stronger than most "mount companys" axles its just not what we consider a racing axle. sorry no warrenty against breakage.