Our rings and spinners are certified lead-free and constructed of stainless steel for strength and durability. This means they won't tarnish—even if you wear them in the shower.  For those of you who are sensitive to nickel, please note that our product is made from stainless steel 316, which is considered surgical grade. Surgical-grade stainless steel may contain some nickel, but it's generally considered hypoallergenic for most people. (Source: mayoclinic.org)