... custom-made/ trial order is also welcomed before mass production(NR,BR,NBR,SBR,CR,EPDM etc) rubber seal Features:1 ... rubber (EPDM, also NBR, SI, HNBR, SBR, CR, BR, IIR, NR, etc),as your request , Environmental Friendly.2. Application: automotive, machinery ... : plastic bag inside, strength carton outside, or as your request. (NR.NBR.SBR.EPDM etc) rubber seal