I use saw cut anodized aluminum rings; anodizing is an electro chemical process that converts the metal surface into a decorative, durable, corrosion-resistant layer. Most anodized products have a long service life when properly taken care of.
The care of aluminum is very easy; it can be thoroughly cleaned with warm water and soap. Aluminum is a great metal to work with, because it is light and strong, and will not discolor or rust.
They are different wire thicknesses, different diameters and various colors. The rings are measured by their ID (inner diameter). The rings contain no nickel or lead and are perfect for making lightweight chainmaille creations.