Our Single Stretch Helm bracelets are constructed using a modified helm weave and anodized aluminum rings that contain no lead or nickel and the EDPM rubber rings have no latex. They 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. The standard length is 7.5" but if you need a different length just let us know.