This bracelet is constructed using a combination of the Helm weave and the Japanese 12-2 weave. It is made with anodized aluminum rings and EDPM rubber rings included in its construction. The aluminum rings have no nickel, lead or zinc and the rubber rings have no latex so our pieces are hypo allergenic. If you order it in the multi-colored option or need it in a size other than the 7.5" standard size just leave me a note in the "Special instructions to seller" section telling me the additional colors you want and if you need it in a different size. It is no problem to make these to your desires, I just need to know.