... 5 shore AMode of stethoscope ear plugs: Compression or injection or extrusionSurface of stethoscope ear plugs:coating with Teflon, Talc ... ,Graphite.etcFeatures of stethoscope ear plugs: Brand New and high ... colorful ,Anti-aging,good flexibility, good elasticityItem:Stethoscope Ear Plugs Material:NBR,HNBR,XNBR,EPDM,SIL,FKM(VITON), ...