NI 520 is made from 1050 steel SYP Offer customer more than 800 kinds of outer C.V joint, inner C.V joint, C ... Japanese, korea, USA, China, germany ,france carAll the C.V joint kit product by SYP is with 1 year quality guranteeCustomer ... from 8620 steelMore information, please contact us Inner C.V joint NI 520