Bracelet length:21cm Bracelet length 16cm suitable for the wrist perimeter is 13cm~14cm; Bracelet length 17cm suitable for the wrist perimeter is 14cm~15cm; Bracelet length 18cm suitable for the wrist perimeter is 15cm~16cm; Bracelet length 19cm suitable for the wrist perimeter is 16cm~17cm; Bracelet length 20cm suitable for the wrist perimeter is 17cm~18cm; Bracelet length 21cm suitable for the wrist perimeter is 18cm~19cm; Material: 100% 925 Sterling silver; Environmental: Lead Free ,Nickel Free , Allergy Free; About 925 sterling silver: 925 silver refers to a silver product containing about 92.5% of silver. The purity is about 92.5%, which is considered pure silver. Because too high purity silver is soft and easily oxidized. 925 silver adds 7.5% other metals to give it the desired hardness. 925 sterling silver is the international standard silver for silver jewelry in the world. Sterling silver maintenance: 1, Avoid contact with chemicals; 2, Avoid wear washing,swimming; 3, Avoid inpact scratches; 4, Avoid wear sporting; 5, Use a soft clothavoid, 6, Take off and store in a dry place when taking a bath and sleeping.