Sterling silver is composed of 92.5% silver, and 7.5% of other metals, most commonly copper. This precise balance allows the alloy to retain the visual properties inherent in silver such as the shiny surface and cool tone, yet taking on the strength of the other metals added to create durability. The resulting alloy is much more practical, as well as cost-effective, than pure silver. Those with metal sensitivities will also find that most sterling silver is hypoallergenic and will not irritate the skin.