Hypoallergenic Titanium: Crafted from implant-grade F136 titanium, these stud earrings are nickel and lead-free. Titanium boasts extremely hypoallergenic and biocompatible to the point of surgical grade implantation into the human body, making it a safe choice for individuals with sensitive ears and allergies. Titanium earrings also features lightweight, waterproof, rustproof, and colorfast characteristics. Size and Packaging: Stud Post Thickness =18G (1.0mm) Stud Post Length: 1/4"(6mm) , 5/16"(8mm) and 3/8" (10mm) You will receive: 6mm post × 1, 8mm post × 1, 10mm post × 1,stud top × 1." Earring Highlights: The cubic zirconia stones adorning the flat back internally threaded stud are of AAAAA grade quality, offering a radiant sparkle. The high-polished surface of the earring posts guarantees a comfortable fit. The flat back design allows for comfortable wear during nap and sleep. The internal thread design enhances the stability and reduces the likelihood of piercing earrings coming off. Versatile Use: The 18G (1.0mm) piercing post thickness accommodates a broader range of piercings than 16G (1.2mm). With 3 post lengths to choose from, these G23 titanium piercing jewelry can be worn in various locations, suitable for cartilage, helix, tragus, conch, earlobe, nose, lip, medusa, labret, and more. Service: If you have any questions, please contact us.It is very important that you have a great experience and enjoy our jewelry. Titanium is known as a "biophilic metal" and is widely used in medical devices and human implants. It can be exposed to iodine volts and does not turn black like silver.  Even if it is immersed in seawater for a long time, it will not affect its nature and avoid human allergy to the greatest extent. Completely free of lead, nickel and cadmium.