Size & Weight: 1#: 16 cm(L) 0.4 cm(W) 0.2 cm(T), about 8.5g 2#: 18 cm(L) 0.4 cm(W) 0.2 cm(T), about 9.2 g Material: s925 sterling silver All our jewelries are made in pure silver & s925 sterling silver, we accept various audits & laboratory tests. Silver knowledge: Sterling silver, also known as 925 sterling silver, is a metal alloy used in jewelry & decorative household objects. Traditionally, it is 92.5% silver (Ag), & 7.5% copper (Cu). the 925 hallmark indicate 92.5% silver purity. Pure silver, also referred to as fine silver, has actual silver content of 99.9%. Because of its high purity, fine silver is soft than sterling silver. Silver Maintenance: Wear it often. Remove during household chores. Keep out of direct sunlight. Wear your jewelry on last (Lotions, makeups, hair spray & perfumes will accelerate tarnishing). Fine Simple Square Shape S925 Sterling Silver Chain Bracelet