Material: Alloy,Size: Outer diameter 3.1cm,        Small wafer diameter 1.8cm,Package include 1 pc Necklace or 1 PC Key Chain,Color: As picture shows,,Notice:,Pictures are only samples for reference. ,Due to limitations in photography and the inevitable differences in monitor settings,,the colors shown in the photograph may not correspond 100% to those in the items themselves.,Because of manual measurement, it will be slightly different.,Please understand.