Our Stretch Avalon bracelets are constructed using a modified European 4-1 weave and anodized aluminum and EDPM Rubber rings. The aluminum rings contain no lead or nickel and EDPM rubber contains no latex. Our pieces are hypoallergenic. They can be ordered in a wide variety of colors or you can contact us to do custom colors. Since they stretch they do not require any other findings and so are easy to take on and off. 7.5" is the standard length for these pieces but if you need a different length just let us know.