... .Precisely mold design 3.Trial order welcomed 4.OEM/ODM SBR o ring sealing Materials advice silicone and rubber(EPDM,NBR ... ,SBR,CR,BR,IIR,NR etc), as your request, environmental friendlyApplicationautomotive, ... .Packageplastic bag inside, strength carton outside,or as your request. SBR o ring sealing