This ring is a parametric design and is avaible in any size, without lose details
The ring on this page is a 17.20 mm diameter size
equivalent to :
size 7 in USA /
size 14 in / Netherlands, Switzerland Spain and China/
size O in /UK, Australia and Surafrica/
If you need any aditional sizes, please let me know, same price
www.bioplastic3d.es