1.our factory was founded in 1985 years 2.supply all kinds of OEM standard intake & exhaust valve 3.ISO 9001:2000 certificate ... 1.We are the professional manufacturer ... IS SUH3(4Cr9Si2). 3. our engine valves are suitable for TOYOTA,AUDI,BESFORD,BMW,CATERILLAR,CUMMINS,DAF,DAIHATSU,DAEWOO,FORD,FIAT ...