... Many standards available Product: glow in the dark o ring O ring is a kind of sealing products which is usually ... main material contains: NR, CR, NBR, SBR, VITON, SILICON, HNBR, PU etc.Item nameO ringMaterialNBR,HNBR,EPDM,SILICONE,VITON,NR,CR ... ODMwelcome Our company produce o-rings (o-ring), waterproof circle, rubber ring, silicon gasket, sealing ring, sealing gaskets, WuGuJia oil-resistant rubber oil ...