Hypoallergenic: These Clear Retainers Are Made Of Clear Flexible IMPLANT GRADE FLEXIBLE ACRYLIC with silicon O-ring, Lead & Nickel Free, Non-Toxic & Allergy Free, Nickel-free and lead-free. Comfortable to wear
Multiple Using: These Clear Retainers are good as Tongue Retainer, Nipple Retainer, Tragus Retainer, Spacers Labret Retainer, Lip Retainer, Clear Cartilage Earrings, for work, surgery, MRIs and more