Most of the rings has adjustable size, which means the standard ring size is 5.5mm and it can be easily adjusted to any larger size. Open ring style, wear it on any finger you want, just squeeze or pull gently to modify the size.
We also have couple of styles that requires the size before the checkout, sizes are in millimetres. You can easily check your fingers size by any paper ruler, that can go around your finger. And now you know your size. If you have any questions about anything, feel free to email us firstname.lastname@example.org.