... quality assurance 4.Good price leather packing ringRubber O Rings1.Item name:Various rubber o rings2.Size:we can make according to ... :EPDM,Silicone,NR,NBR,Viton4.Hardness:30-95 shore A.5.Colour:Red.green,black,grey,and so on.6.Molding ... 100% imported medical grade silicone rubber, non-toxic, odorless, harmless2. It is manufactured in hermetic environment, waterproof, dirt resistant, anti-oil, anti ...