3D printed sizing kit for the Oura ring (not official, but does the same job).  

We have designed and manufactured these to support people who would like to buy a ring second hand. 

Rings are dispatched as standard by Royal Mail 2nd Class (no tracking), if you require a faster service please select the 48h tracked shipping service at checkout. 

Colour may vary from that pictured depending on stock (black, dark grey, silver)