As the international standard silver, 925 sterling silver is produced by alloy of 92.5% 的银加上7.5% according to the regulations. And this proportion can just inject some hardness into the soft pure silver to form the earring material of zuiwanmei sculpture. And to the friend with sensitive and weak skin, choose pure silver ear needle material to also won't have the phenomenon of red Zhong to produce relatively (depend on each person constitution and decide)