... :Flexibility strong 3:stand strong collision 4:customized 5: diaphram with rubber,long lifetime Features: MaterialNBR,HNBR, MVQ, NR, EPDM, FKM ... :1998,ISO14001:2004Factory historymore than 14 years RoHS RoHS directive compliant green products Strong pointWe have our own mold center, can ... most kinds of high tech required molds. Black rubber diaphragm with good quality