... and Brass or others 2.Shape:Ring Gasket 3.Standard or Nonstandard:Standard 4.OEM Service:Available High Accuracy Brass ... 2) Material:Brass,copper,bronze(H59,H62,H683) High quality, high precision and reasonable price4) ... ASTM,JIS,BS,non standard,etc3) Material:Brass,copper,bronze(H59,H62,H68,etc)4 ... in China. We have advantaged technologh,and can product the different copper washer professionally ...