Size(US Size): 6 / 7 / 8 ,Note: There may be an error between 0.1-0.4 mm, because of different measurements, thanks for your understanding!  Please determine the size and then purchase them. Thank you for visiting! ,Size 6 - Perimeter(51.8mm),Size 7 - Perimeter(54.4mm),Size 8 - Perimeter(56.5mm),,Material: Alloy,Package include 1 pc ring,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.