Niobium is a naturally occurring element (41 on the periodic table) and is hypo-allergenic. It is a grey color in it's natural state, but can be anodized in a wide array of colors. When anodized, no color is actually added. An electrical current passed through it produces an oxide layer that reflects light and lets you see color.
Rainbow is multiple colors on a single ring
Confetti is a random sampling of all available colors
|Actual wire diameter||.064", 1.64mm|
|Wire gauge||16 (SWG)|
|Actual ID inches||.259"|
|Actual ID mm||6.59|
|Approx rings per oz||65|