... diaphragm 2:Flexibility strong 3:stand strong collision 4:customized 5: diaphram with rubber,long lifetime Features: MaterialNBR,HNBR, MVQ, ... )Color black, red, white, green, yellow, blue, brown, according to customers'requirementsWeight0.01-10gMOQAbout 5000PCSOEMOEM is welcomedDetails Different material has different performance ... of high tech required molds. Black rubber diaphragm with good quality