We only use the best hypoallergenic, allergy free metals. That means no Surgical Stainless Steel (which has Nickel in), no Silver, no Gold and no Zinc, for absolutely no worries! We use metals such as Titanium, and Tantalum assay tested and verified. No surprises thanks to no compromises on materials. Always inert, hypoallergenic, and completely Nickel Free for absolutely no unwelcome reactions