Copper/Niobium Superconductor
4#‌: inner diameter 14.8mm
5#: inner diameter 15.7mm
6#: inner diameter 16.5mm
7#‌: inner diameter 17.3mm
8#‌: inner diameter 18.2mm
9#: inner diameter 19mm
10#: inner diameter 19.8mm
11#: inner diameter 20.6mm
12#: inner diameter 21.4mm
please note that the patttern of this ring will be differ from one to another
due to the way it produce.
Item included: 1pc of ring