Three adorable tiny heart studs on one card with hypoallergenic titanium posts which are nickel and lead-free. The colors are Red, Black, and Pink. The studs measure 7mm and are made of 24K zinc alloy gold plated. The titanium posts are naturally hypoallergenic. Since they are non-reactive to the human body, the chances of an allergic reaction are minimal. The details: 3X 7mm hearts Hypoallergenic posts enamel 24K Gold plated