Our Midgard Necklaces are constructed using the traditional 3-1 Half Persian weave and anodized aluminum rings. they contain no lead or nickel and are hypoallergenic. They can be ordered in a wide variety of colors or you can contact us to do custom colors. They are made with 18 gauge 1/4" anodized aluminum rings. 18" is the standard length for these pieces but if you need it a different length just let us know.