1.SGS,ISO,for different machines 2.SR,EPDM,SBR,CR,NBR,FPM ... ,EPDM,NR,SBR3.color:available in any color,according to customer's requirement4.working pressure:<= -35--200 ... or customerizedcertification:ISO9001 ,SGSwe are looking forware for your visit to our factory. Rubber seal/gasketMaterialEPDM,NBR,SR ... cooperation,make sure good quality rubber material for production3.SGS,ISO certificate,make the test ...