1.Type :R,BX,RX,IX 2.Material:soft iron, ss304,ss316, CS ... These gaskets are designed in oval/octagonal shapes confirming to R,Bx and Rx series of API std 6A. DONGFENG RING ... Flange StandardsRJG typeRJG StandardFlange StandardRASME B 16.20,API 6AANSI B 16.5,ANSI B 16.47 ARXASME B 16.20,API 6AAPI 6BBXAPI ...