Consist of Tire valve:brass & natural rubber,EPDM CE:ISO/TS16949,TUV, ISO9001 ITEM NO.:TR525MS TR43E, ... of only the highest quality materials2.Material :brass, natural rubber, EPDM,9002 core,cap3.CE: ISO/TS16949:2002 &TUV & ISO9001:2000quality system ...