1.Material:Copper and Brass or others 2.Shape:Ring Gasket 3.Standard or Nonstandard:Standard 4.OEM Service:Available Long Life Copper Flat Washers, Copper ... ,JIS,BS,non standard,etc3) Material:Brass,copper,bronze(H59,H62,H68,etc)4) All head types and sizes are available5) Packing ...