These 4PCS Stainless Steel Stud Barbell Tongue Rings 14 Gauge 6mm Ball Nipple Bars Piercing Jewelry are made of high quality 316L stainless steel, which is durable, hypoallergenic, and safe for sensitive skin. They are perfect for men and women and can be used for tongue, lip, nose, eyebrow, cartilage, helix, and nipple piercings. The ball size is 6mm, which is suitable for most piercings. The package includes 4 pieces of tongue rings, each with a different color, so you can mix and match them according to your personal style. They are easy to wear and remove, making them a great gift for friends or loved ones.