Hypoallergenic: surgical titanium posts Size: 4 mm Gift-ready packaging Perfect for active kids, these screwback studs deliver style with dependability. Made with hypoallergenic materials and surgical titanium posts that won't irritate sensitive ears, the secure screw mechanism ensures they stay put through all her daily activities. Features Type : Screwback Stud Earrings that are secure Material : The post that goes into the ear is Surgical Titanium, Rest of the material is brass with a yellow gold plating or Palladium plating (similar to white gold just more hypoallergenic) Stone : Crystal Size : 4 MM Age : Young Child-Tween Hypoallergenic kids earrings - no more sensitive ears! Free shipping for all orders Satisfaction Guarantee or money back - you will love these cute earrings for kids!