Square Cubic Zirconia Studs | Sensitive Skin Friendly✅ | Shiny finish Approx. " in length. This piece is made of our proprietary zinc alloy which makes her sensitive skin friendly. When we developed our line, we tested it on our team, including our owner's cousin who is highly allergic to nickel. She passed the wear-test with flying colors! We also double coat all of our pieces so they last longer, resist water, and shine brighter!