Steel captive ring made with 316L surgical grade stainless steel. This 16 gauge captive ring is a universal body jewelry piercing. This Swarovski captive bead is versatile enough for ears, lips, eyebrows, nipples, and much more.. Specifications: 16 Gauge (1.2mm), 5/16 Inches (8mm), 316L Surgical Grade Stainless Steel, 4mm Ball, Genuine Swarovski® Crystal (Swarovski is a registered trademark of Swarovski AG.)