1:PTFE diaphragm 2:Flexibility strong 3:stand strong collision 4:customized 5: diaphram with rubber,long lifetime Features: MaterialNBR,HNBR, MVQ, ... set, high temperature resistance, low temperature resistance, ozone resistance... )Color black, red, white, green, yellow, blue, brown, according to customers ... can develop most kinds of high tech required molds. Black rubber diaphragm with good quality