1. Prepare a piece of paper

2. Follow the method on the picture to wear the finger of the ring, around the week, the finger skin is loose, so it must be as close as possible

3. The nails are held at the intersection for accurate measurement

4. Keep the pinch position and the pen in the other hand

5. Use a pen to make a mark

6. Use a ruler to measure its circumference

7. Refer to the table below to choose the size that suits you.