... large and 2 snap tight soft-sealing ear tips - small Replacement of the ear tips on all Littman stethoscopesFood grade material ... of stethoscope ear plugs: FDA or SGS certificate Oxidation ... colorful ,Anti-aging,good flexibility, good elasticityItem:Stethoscope Ear Plugs Material:NBR,HNBR,XNBR,EPDM,SIL,FKM(VITON), ...