Please Note: Please choose either men or women in the size of your choice; If you choose 2 for both woman and man ; Please place 2 separate orders! Description: Type: Titanium Steel Black Ring Material: Titanium Steel Gender: Women, Men Color: Black Style: Europe and America Weight: About 6g Female Size(US): 5# 6#, 7#, 8#, 9# Male Size(US): 8#, 9#, 10#, 11# Size Details: Size(US) 5 6 7 8 9 10 11 Diameter(mm) 15.8 16.4 17.0 18.2 19.0 19.8 20.7 Perimeter(mm) 50 52 54 57 60 62.5 65 Package Includes: 1 X Titanium Steel Black Ring Notice: 1.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please consider this before the purchase. 2.Please allow slight deviation for the measurement data.