... .Trial order welcomed 4.OEM/ODM OEM molded rubber sleeve Materials advice silicone and rubber(EPDM,NBR,SBR,CR,BR,IIR,NR etc ... or IRHD, tolerance can be ±5 shore A, for some special products, we can reach ± 3 shore A tolerance.High QA ... inside, strength carton outside,or as your request. OEM molded rubber sleeve