The ring size of ten degrees is determined using the circumference of the inner-band. To find out the right ring size for you, you only need a thread or a piece of paper. Wrap the thread or the paper around the part of the finger where you would like to wear the ring, and then measure its length. The length measured in millimetres will be the inner circumference of the ring.
Please note the following when ordering a combination of base and spinner rings: for the spinner ring to fit over the base ring, the spinner ring must be correspondingly larger.