... 3.size: any design silicone rubber mold,gasket sheet,gasket setmaterial:SBR rubber gasket,EPDM.CR,NR,NBR,silicone,vitonType:O-ring.V-ring ... ,X-ring,Y-ring,D-ring,T-ring,L-ring etc.using: mainly used to seal ... oil and water proof ,anti-corrosion gas, prevent the leak of othe gas.Viton rubber gasket1.hardness 55 ...