1: H57 Brass Body And Zinc-Alloy Handle 2: Ni3-5um Cr0.2-0.3 3: Ceramic Cartridge 1:Advantage1:gravity casing technology 2:composition(Cu>57,Pb<1.8,Fe<0.3)LOW Pb content is harmless for your healthy.It is with a user to use for the purpose of health and safety3:MS ceramic cartridge,500000 times for both open and close,if you open and close 50 times one day,it can be used for more than 25 ...