1,o ring seal kit 2,various specification and good quality 3,NBR, ... ,EPDM. 4,make O-rings by customer`s drawing o ring seal kit1. Material: NBR, EPDM, MVQ(Silicon rubber), VITON.etc2 ... .we have various specification and More than 4000 sets standard size O-ring tool.4.Different color is available5.Characteristics:high/low ...