Material: Grade 23 (G23) Titanium (more comfortable,smooth and lighter than 316L Surgical Steel) Gauge (Size):16G(1.2mm);Bar Length: 1/2"(12mm),9/16"(14mm) and 5/8"(16mm); Ball Dia.:5mm Hypoallergenic and no nickel body jewelry for nipple rings, tongue piercing and industrial earrings. It's a nice gift for you ,lover, friends and so on. Package includes: 3 pairs titanium nipple rings(each size one pair), in one gift velet bag. Description: Nipplerings material is Grade 23 Titanium (implant grade, better than 316L Surgical Steel) with satisfaction guarantee which is safe solution for surgery .Due to the camera and the computer screen showing, the color maybe a little different, please kindly understand.