... , we can supply different standards of o ring kits. Inch rubber o ring kit Features:1) Available material : material for Silicone ... ,Fsil,VITON(FKM)&Dow elastomers,Neoprene,HNBR,Natural rubber,SBR,IR,IIR(butyl rubber),ACM ect.NSF an KTW approved for material ... , oil resistance, anti-ozone and aging, wearable,great flexibility etc. inch rubber o ring kit box