... 3:stand strong collision 4:customized 5: diaphram with rubber,long lifetime Features: MaterialNBR,HNBR, MVQ, NR, EPDM, FKM(VITON),ACM ... , according to customers'requirementsWeight0.01-10gMOQAbout 5000PCSOEMOEM is welcomedDetails Different material has different performance, we can manufacture at customers's requirementsCertificationISO ...