Blomdahl EP MP 4mm Ruby earrings are medical-grade plastic earrings designed for safe ear piercing. These hypoallergenic studs feature a beautiful ruby-colored crystal in a clear plastic setting, offering both style and safety for sensitive ears. As this is a medical/personal care product used for ear piercing, additional details about materials and safety features are best discussed with a healthcare professional. The product should only be used in proper medical settings following appropriate sterilization and piercing procedures.