... .customized color,shape 4.according to Rosh,CE,PAHS,WARS rubber stopper:1, Material:NBR,CR,SBR, EPDM,IIR,NR,EP ... resistance,oil and fuel resistance,weathering resistance,Ozone resistance etc.4, Certification:ISO9001:2008,ROHS,FDA5, Packing: plastic bag&carton ... 1.High degree of torrential stiffness2.Wear and tear free3.Resistance to oxidation, ozone and radiation4.Indefinite shelf life5.Anti abrasive