Phenolic paper is a material often used to make printed circuit board substrates. It is a very tough board made of wood fiber and phenolic polymers.
Copper Superconductor is a unique fusion of niobium and titanium with copper. This material finds its origins in particle accelerators and MRI machines.
Size: 13 Width: 10mm
The ring pictured is the exact ring you will receive.
Arrives boxed with custom leather pouch and certificate of authenticity.