How to work out your sizing:
First you’ll need to work out what size Spacer/Ring module you need. To do this first take a look at your middle finger - the one which will go through the ring. You need to measure the thickest part of this finger. Some people have knuckles that are the thickest part of the finger, and in this case you’ll measure the knuckle. For others, the finger above the knuckle is thicker - so if thats the case for you then measure the finger above the knuckle.
So, take a 10mm wide strip of paper and wrap it the section of your finger that you need to me
asure -as above.